diff --git a/.gitignore b/.gitignore
index 0104787..1cba316 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,9 +6,13 @@ target/
 # These are backup files generated by rustfmt
 **/*.rs.bk
 
+# Error / Debug Logging
+*.log
+
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
 
+
 # RustRover
 #  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
diff --git a/Cargo.lock b/Cargo.lock
index f548823..ed0b48d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -129,6 +129,15 @@ version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
+[[package]]
+name = "crc32fast"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a97769d94ddab943e4510d138150169a2758b5ef3eb191a9ee688de3e23ef7b3"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "crypto-common"
 version = "0.1.6"
@@ -221,6 +230,16 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
 
+[[package]]
+name = "flate2"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "11faaf5a5236997af9848be0bef4db95824b1d534ebc64d0f0c6cf3e67bd38dc"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -1737,8 +1756,10 @@ version = "0.1.0"
 dependencies = [
  "colored",
  "ctrlc",
+ "flate2",
  "md-5",
  "reqwest",
+ "serde",
  "serde_json",
  "shellexpand",
  "winconsole",
diff --git a/Cargo.toml b/Cargo.toml
index a023975..934f496 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,9 +5,11 @@ edition = "2024"
 
 [dependencies]
 colored = "3.0.0"
+md-5 = "0.10.6"
 reqwest = { version = "0.12.15", features = ["blocking", "json"] }
-serde_json = "1.0"
-md-5 = "0.10"
-ctrlc = "3.2"
+serde_json = "1.0.140"
+serde = "1.0.219"
+winconsole = "0.11.1"
+ctrlc = "3.4.5"
 shellexpand = "3.1.0"
-winconsole = "0.11"
\ No newline at end of file
+flate2 = "1.1.0"
\ No newline at end of file
diff --git a/README.md b/README.md
index 7d13c8a..6cd0fab 100644
--- a/README.md
+++ b/README.md
@@ -5,39 +5,61 @@
 [![Rust](https://img.shields.io/badge/Rust-1.87.0--nightly-orange?logo=rust)](https://www.rust-lang.org/)
 [![License](https://img.shields.io/badge/License-MIT-blue)](LICENSE)
 
+## 📦 Requirements
+- **Rust nightly toolchain** - 1.87.0-nightly or newer
+- **Windows** - for full console feature support
+
+Install the nightly toolchain with:
+```bash
+rustup toolchain install nightly
+rustup default nightly
+```
+
+### 🛠️ Installation
+- **Clone the repository:**
+```bash
+git clone https://github.com/yourusername/wuthering-waves-downloader.git
+cd wuthering-waves-downloader
+```
+- **Build the project:**
+```bash
+cargo build --release
+```
+- **Run the downloader:**
+```bash
+cargo run --release # (or run the built executable inside target/release/)
+```
+
 ## 🚀 Features
 
 ### 🛠️ Core Functionality
 - **Verified Downloads** - MD5 checksum validation for every file
 - **Batch Processing** - Downloads all game resources sequentially
 - **Network Resiliency** - Timeout protection (30s/60s) with retry logic
+- **HEAD Request Verification** - Pre-checks file availability before download
+- **Automatic Retries** - Configurable retry attempts for failed downloads
 
 ### 📂 File Management
 - **Smart Path Handling** - Cross-platform path support with tilde (~) expansion
 - **Auto-directory Creation** - Builds full directory trees as needed
 - **Clean Failed Downloads** - Automatically removes corrupted files
+- **Comprehensive Logging** - Detailed error logging with timestamps
 
-### 🌈 User Interface
+### 💻 User Interface
 - **Color-coded Output** - Instant visual feedback (success/warning/error)
 - **Progress Tracking** - Real-time counters (`[X/Y]`) for batch downloads  
 - **Interactive Prompts** - Guided directory selection with validation
+- **Dynamic Title Updates** - Real-time progress in window title
+- **Formatted Duration Display** - Clear elapsed time tracking (HH:MM:SS)
 
 ### ⚡ Performance & Safety
 - **Streaming Downloads** - Chunked transfers for memory efficiency
 - **Atomic Operations** - Thread-safe progress tracking
 - **Graceful Interrupt** - CTRL-C handling with summary display
+- **Memory Efficiency** - Minimal allocations during downloads
 
 ### 🔒 Reliability
 - **Pre-flight Checks** - HEAD requests verify availability before download
 - **Comprehensive Error Handling** - Network, filesystem, and validation errors
 - **Consistent State** - Never leaves partial downloads on failure
-
-## 📦 Requirements
-
-- Rust nightly toolchain (1.87.0-nightly or newer)
-- Windows (for full console feature support)
-
-Install the nightly toolchain with:
-```bash
-rustup toolchain install nightly
-rustup default nightly
+- **Validation Failures** - Auto-removes files with checksum mismatches
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 0a5f141..cbe3031 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,88 +1,357 @@
 use std::{
-    fs,
-    io::{self, Write},
+    fs::{self, OpenOptions},
+    io::{self, Read, Write},
     path::{Path, PathBuf},
-    time::Duration,
     sync::Arc,
+    thread,
+    time::{Duration, Instant, SystemTime},
 };
 
 use colored::*;
+use flate2::read::GzDecoder;
 use md5::{Digest, Md5};
-use reqwest::{blocking::Client, StatusCode};
-use serde_json::{Value, from_str};
+use reqwest::{StatusCode, blocking::Client};
+use serde_json::{Value, from_reader, from_str};
 use winconsole::console::{clear, set_title};
 
-const INDEX_URL: &str = "https://hw-pcdownload-aws.aki-game.net/launcher/game/G153/2.2.0/onnOqcAkPIKgfEoFdwJcgRzLRNLohWAm/resource/50004/2.2.0/indexFile.json";
-const ZIP_BASE: &str = "https://hw-pcdownload-aws.aki-game.net/launcher/game/G153/2.2.0/onnOqcAkPIKgfEoFdwJcgRzLRNLohWAm/zip/";
+const INDEX_URL: &str = "https://gist.githubusercontent.com/yuhkix/b8796681ac2cd3bab11b7e8cdc022254/raw/30a8e747debe9e333d5f4ec5d8700dab500594a2/wuwa.json";
+const MAX_RETRIES: usize = 3;
+const DOWNLOAD_TIMEOUT: u64 = 300; // minutes in seconds
 
 struct Status;
 
 impl Status {
-    fn info() -> ColoredString { "[*]".cyan() }
-    fn success() -> ColoredString { "[+]".green() }
-    fn warning() -> ColoredString { "[!]".yellow() }
-    fn error() -> ColoredString { "[-]".red() }
-    fn question() -> ColoredString { "[?]".blue() }
-    fn progress() -> ColoredString { "[→]".magenta() }
+    fn info() -> ColoredString {
+        "[*]".cyan()
+    }
+    fn success() -> ColoredString {
+        "[+]".green()
+    }
+    fn warning() -> ColoredString {
+        "[!]".yellow()
+    }
+    fn error() -> ColoredString {
+        "[-]".red()
+    }
+    fn question() -> ColoredString {
+        "[?]".blue()
+    }
+    fn progress() -> ColoredString {
+        "[→]".magenta()
+    }
 }
 
-fn get_dir() -> PathBuf {
+#[derive(Clone)]
+struct DownloadConfig {
+    index_url: String,
+    zip_bases: Vec<String>,
+}
+
+fn setup_logging() -> fs::File {
+    let log_file = OpenOptions::new()
+        .create(true)
+        .append(true)
+        .open("logs.log")
+        .expect("Failed to create/open log file");
+
+    log_file
+}
+
+fn log_error(mut log_file: &fs::File, message: &str) {
+    let timestamp = SystemTime::now()
+        .duration_since(SystemTime::UNIX_EPOCH)
+        .unwrap()
+        .as_secs();
+
+    writeln!(log_file, "[{}] ERROR: {}", timestamp, message).expect("Failed to write to log file");
+}
+
+fn fetch_gist(client: &Client) -> Result<String, String> {
+
+    let mut response = client
+        .get(INDEX_URL)
+        .timeout(Duration::from_secs(30))
+        .send()
+        .map_err(|e| format!("Network error: {}", e))?;
+
+    if !response.status().is_success() {
+        return Err(format!("Server error: HTTP {}", response.status()));
+    }
+
+    let content_encoding = response
+        .headers()
+        .get("content-encoding")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("");
+
+    let gist_data: Value = if content_encoding.contains("gzip") {
+        let mut buffer = Vec::new();
+        response
+            .copy_to(&mut buffer)
+            .map_err(|e| format!("Error reading response bytes: {}", e))?;
+
+        let mut gz = GzDecoder::new(&buffer[..]);
+        let mut decompressed = String::new();
+        gz.read_to_string(&mut decompressed)
+            .map_err(|e| format!("Error decompressing content: {}", e))?;
+
+        from_str(&decompressed).map_err(|e| format!("Invalid JSON: {}", e))?
+    } else {
+        from_reader(response).map_err(|e| format!("Invalid JSON: {}", e))?
+    };
+
+    println!("{} Available versions:", Status::info());
+    println!("1. Preload - OS");
+    println!("2. Live - CN (Needs Update)");
+    println!("3. Beta - OS (Needs Update)");
+    println!("4. Beta - CN (Needs Update)");
+
     loop {
-        print!("{} Enter download directory (Enter for current): ", Status::question());
+        print!("{} Select version to download: ", Status::question());
         io::stdout().flush().unwrap();
-        
+
         let mut input = String::new();
         io::stdin().read_line(&mut input).unwrap();
-        let path = input.trim();
-        
-        let path = if path.is_empty() {
-            std::env::current_dir().unwrap()
-        } else {
-            PathBuf::from(shellexpand::tilde(path).into_owned())
-        };
-        
-        if path.is_dir() {
-            return path;
-        }
-        
-        print!("{} Directory doesn't exist. Create? (y/n): ", Status::warning());
-        io::stdout().flush().unwrap();
-        
-        let mut input = String::new();
-        io::stdin().read_line(&mut input).unwrap();
-        
-        if input.trim().to_lowercase() == "y" {
-            fs::create_dir_all(&path).unwrap();
-            return path;
+        let choice = input.trim();
+
+        match choice {
+            "1" => {
+                return gist_data["live"]["os-live"]
+                    .as_str()
+                    .map(|s| s.to_string())
+                    .ok_or("Missing os-live URL".to_string());
+            }
+            "2" => {
+                return gist_data["live"]["cn-live"]
+                    .as_str()
+                    .map(|s| s.to_string())
+                    .ok_or("Missing cn-live URL".to_string());
+            }
+            "3" => {
+                return gist_data["beta"]["os-beta"]
+                    .as_str()
+                    .map(|s| s.to_string())
+                    .ok_or("Missing os-beta URL".to_string());
+            }
+            "4" => {
+                return gist_data["beta"]["cn-beta"]
+                    .as_str()
+                    .map(|s| s.to_string())
+                    .ok_or("Missing cn-beta URL".to_string());
+            }
+            _ => println!("{} Invalid selection, please try again", Status::error()),
         }
     }
 }
 
-fn fetch_index(client: &Client) -> Value {
-    println!("{} Fetching index file...", Status::info());
-    
-    let response = client.get(INDEX_URL)
+fn get_predownload(client: &Client) -> Result<DownloadConfig, String> {
+    let selected_index_url = fetch_gist(client)?;
+    println!("{} Fetching download configuration...", Status::info());
+
+    let mut response = client
+        .get(&selected_index_url)
         .timeout(Duration::from_secs(30))
         .send()
-        .unwrap_or_else(|e| {
+        .map_err(|e| format!("Network error: {}", e))?;
+
+    if !response.status().is_success() {
+        return Err(format!("Server error: HTTP {}", response.status()));
+    }
+
+    let content_encoding = response
+        .headers()
+        .get("content-encoding")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("");
+
+    let config: Value = if content_encoding.contains("gzip") {
+        let mut buffer = Vec::new();
+        response
+            .copy_to(&mut buffer)
+            .map_err(|e| format!("Error reading response bytes: {}", e))?;
+
+        let mut gz = GzDecoder::new(&buffer[..]);
+        let mut decompressed = String::new();
+        gz.read_to_string(&mut decompressed)
+            .map_err(|e| format!("Error decompressing content: {}", e))?;
+
+        from_str(&decompressed).map_err(|e| format!("Invalid JSON: {}", e))?
+    } else {
+        from_reader(response).map_err(|e| format!("Invalid JSON: {}", e))?
+    };
+
+    let predownload_config = config
+        .get("predownload")
+        .and_then(|p| p.get("config"))
+        .ok_or("Missing predownload.config in response")?;
+
+    let base_url = predownload_config
+        .get("baseUrl")
+        .and_then(Value::as_str)
+        .ok_or("Missing or invalid baseUrl")?;
+
+    let index_file = predownload_config
+        .get("indexFile")
+        .and_then(Value::as_str)
+        .ok_or("Missing or invalid indexFile")?;
+
+    let default_config = config
+        .get("default")
+        .ok_or("Missing default config in response")?;
+
+    let cdn_list = default_config
+        .get("cdnList")
+        .and_then(Value::as_array)
+        .ok_or("Missing or invalid cdnList")?;
+
+    let mut cdn_urls = Vec::new();
+    for cdn in cdn_list {
+        if let Some(url) = cdn.get("url").and_then(Value::as_str) {
+            cdn_urls.push(url.trim_end_matches('/').to_string());
+        }
+    }
+
+    if cdn_urls.is_empty() {
+        return Err("No valid CDN URLs found".to_string());
+    }
+
+    let full_index_url = format!("{}/{}", cdn_urls[0], index_file.trim_start_matches('/'));
+    let zip_bases = cdn_urls
+        .iter()
+        .map(|cdn| format!("{}/{}", cdn, base_url.trim_start_matches('/')))
+        .collect();
+
+    Ok(DownloadConfig {
+        index_url: full_index_url,
+        zip_bases,
+    })
+}
+
+fn fetch_index(client: &Client, config: &DownloadConfig, log_file: &fs::File) -> Value {
+    println!("{} Fetching index file...", Status::info());
+
+    let mut response = match client
+        .get(&config.index_url)
+        .timeout(Duration::from_secs(30))
+        .send()
+    {
+        Ok(resp) => resp,
+        Err(e) => {
+            log_error(log_file, &format!("Error fetching index file: {}", e));
             clear().unwrap();
             println!("{} Error fetching index file: {}", Status::error(), e);
             println!("\n{} Press Enter to exit...", Status::warning());
             let _ = io::stdin().read_line(&mut String::new());
             std::process::exit(1);
-        });
-    
+        }
+    };
+
     if !response.status().is_success() {
+        let msg = format!("Error fetching index file: HTTP {}", response.status());
+        log_error(log_file, &msg);
         clear().unwrap();
-        println!("{} Error fetching index file: HTTP {}", Status::error(), response.status());
+        println!("{} {}", Status::error(), msg);
         println!("\n{} Press Enter to exit...", Status::warning());
         let _ = io::stdin().read_line(&mut String::new());
         std::process::exit(1);
     }
-    
-    let text = response.text().unwrap();
+
+    let content_encoding = response
+        .headers()
+        .get("content-encoding")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("");
+
+    let text = if content_encoding.contains("gzip") {
+        let mut buffer = Vec::new();
+        if let Err(e) = response.copy_to(&mut buffer) {
+            log_error(log_file, &format!("Error reading index file bytes: {}", e));
+            clear().unwrap();
+            println!("{} Error reading index file: {}", Status::error(), e);
+            println!("\n{} Press Enter to exit...", Status::warning());
+            let _ = io::stdin().read_line(&mut String::new());
+            std::process::exit(1);
+        }
+
+        let mut gz = GzDecoder::new(&buffer[..]);
+        let mut decompressed_text = String::new();
+        if let Err(e) = gz.read_to_string(&mut decompressed_text) {
+            log_error(log_file, &format!("Error decompressing index file: {}", e));
+            clear().unwrap();
+            println!("{} Error decompressing index file: {}", Status::error(), e);
+            println!("\n{} Press Enter to exit...", Status::warning());
+            let _ = io::stdin().read_line(&mut String::new());
+            std::process::exit(1);
+        }
+        decompressed_text
+    } else {
+        match response.text() {
+            Ok(t) => t,
+            Err(e) => {
+                log_error(
+                    log_file,
+                    &format!("Error reading index file response: {}", e),
+                );
+                clear().unwrap();
+                println!("{} Error reading index file: {}", Status::error(), e);
+                println!("\n{} Press Enter to exit...", Status::warning());
+                let _ = io::stdin().read_line(&mut String::new());
+                std::process::exit(1);
+            }
+        }
+    };
+
     println!("{} Index file downloaded successfully", Status::success());
-    from_str(&text).unwrap()
+
+    match from_str(&text) {
+        Ok(v) => v,
+        Err(e) => {
+            log_error(log_file, &format!("Error parsing index file JSON: {}", e));
+            clear().unwrap();
+            println!("{} Error parsing index file: {}", Status::error(), e);
+            println!("\n{} Press Enter to exit...", Status::warning());
+            let _ = io::stdin().read_line(&mut String::new());
+            std::process::exit(1);
+        }
+    }
+}
+
+fn get_dir() -> PathBuf {
+    loop {
+        print!(
+            "{} Enter download directory (Enter for current): ",
+            Status::question()
+        );
+        io::stdout().flush().unwrap();
+
+        let mut input = String::new();
+        io::stdin().read_line(&mut input).unwrap();
+        let path = input.trim();
+
+        let path = if path.is_empty() {
+            std::env::current_dir().unwrap()
+        } else {
+            PathBuf::from(shellexpand::tilde(path).into_owned())
+        };
+
+        if path.is_dir() {
+            return path;
+        }
+
+        print!(
+            "{} Directory doesn't exist. Create? (y/n): ",
+            Status::warning()
+        );
+        io::stdout().flush().unwrap();
+
+        let mut input = String::new();
+        io::stdin().read_line(&mut input).unwrap();
+
+        if input.trim().to_lowercase() == "y" {
+            fs::create_dir_all(&path).unwrap();
+            return path;
+        }
+    }
 }
 
 fn calculate_md5(path: &Path) -> String {
@@ -92,114 +361,304 @@ fn calculate_md5(path: &Path) -> String {
     format!("{:x}", hasher.finalize())
 }
 
-fn download_file(client: &Client, dest: &str, folder: &Path, expected_md5: Option<&str>) -> bool {
+fn download_file(
+    client: &Client,
+    config: &DownloadConfig,
+    dest: &str,
+    folder: &Path,
+    expected_md5: Option<&str>,
+    log_file: &fs::File,
+) -> bool {
     let dest = dest.replace('\\', "/");
-    let url = format!("{}{}", ZIP_BASE, dest);
     let path = folder.join(&dest);
-    
+
     if let Some(parent) = path.parent() {
-        fs::create_dir_all(parent).unwrap();
-    }
-    
-    // Check if file exists first
-    let head_response = match client.head(&url).timeout(Duration::from_secs(10)).send() {
-        Ok(resp) => resp,
-        Err(_) => {
-            println!("{} File not available: {}", Status::warning(), dest.yellow());
+        if let Err(e) = fs::create_dir_all(parent) {
+            log_error(
+                log_file,
+                &format!("Error creating directory for {}: {}", dest, e),
+            );
+            println!("{} Error creating directory: {}", Status::error(), e);
             return false;
         }
-    };
-    
-    if head_response.status() != StatusCode::OK {
-        println!("{} File not available: {}", Status::warning(), dest.yellow());
-        return false;
     }
-    
-    println!("{} Downloading: {}", Status::progress(), dest);
-    
-    let response = match client.get(&url)
-        .timeout(Duration::from_secs(60))
-        .send() {
+
+    for (i, base_url) in config.zip_bases.iter().enumerate() {
+        let url = format!("{}{}", base_url, dest);
+
+        let head_response = match client.head(&url).timeout(Duration::from_secs(10)).send() {
             Ok(resp) => resp,
             Err(e) => {
-                clear().unwrap();
-                println!("{} Download failed: {} - {}", Status::error(), dest.red(), e);
-                return false;
+                log_error(
+                    log_file,
+                    &format!("CDN {} failed for {} - {}", i + 1, dest, e),
+                );
+                continue;
             }
         };
-    
-    if !response.status().is_success() {
-        clear().unwrap();
-        println!("{} Download failed: {} - HTTP {}", Status::error(), dest.red(), response.status());
-        return false;
-    }
-    
-    let mut file = fs::File::create(&path).unwrap();
-    let mut content = response;
-    io::copy(&mut content, &mut file).unwrap();
-    
-    if let Some(expected) = expected_md5 {
-        let actual = calculate_md5(&path);
-        if actual != expected {
-            fs::remove_file(&path).unwrap();
-            println!("{} Checksum failed: {}", Status::error(), dest.red());
+
+        if head_response.status() != StatusCode::OK {
+            log_error(
+                log_file,
+                &format!(
+                    "CDN {} failed for {} (HTTP {})",
+                    i + 1,
+                    dest,
+                    head_response.status()
+                ),
+            );
+            continue;
+        }
+
+        println!("{} Downloading: {}", Status::progress(), dest);
+
+        let mut retries = MAX_RETRIES;
+        let mut last_error = None;
+
+        while retries > 0 {
+            let result = (|| -> Result<(), Box<dyn std::error::Error>> {
+                let response = client
+                    .get(&url)
+                    .timeout(Duration::from_secs(DOWNLOAD_TIMEOUT))
+                    .send()?;
+
+                if !response.status().is_success() {
+                    return Err(response.error_for_status().unwrap_err().into());
+                }
+
+                let mut file = fs::File::create(&path)?;
+                let mut content = response;
+                io::copy(&mut content, &mut file)?;
+
+                Ok(())
+            })();
+
+            match result {
+                Ok(_) => break,
+                Err(e) => {
+                    last_error = Some(e.to_string());
+                    log_error(
+                        log_file,
+                        &format!(
+                            "Download attempt failed for {} ({} retries left): {}",
+                            dest,
+                            retries - 1,
+                            e
+                        ),
+                    );
+
+                    retries -= 1;
+                    let _ = fs::remove_file(&path);
+
+                    if retries > 0 {
+                        println!(
+                            "{} Retrying download for {}... ({} attempts left)",
+                            Status::warning(),
+                            dest,
+                            retries
+                        );
+                    }
+                }
+            }
+        }
+
+        if retries == 0 {
+            log_error(
+                log_file,
+                &format!(
+                    "Download failed after retries for {}: {}",
+                    dest,
+                    last_error.unwrap_or_default()
+                ),
+            );
+            println!("{} Download failed: {}", Status::error(), dest.red());
             return false;
         }
+
+        if let Some(expected) = expected_md5 {
+            let actual = calculate_md5(&path);
+            if actual != expected {
+                log_error(
+                    log_file,
+                    &format!(
+                        "Checksum failed for {}: expected {}, got {}",
+                        dest, expected, actual
+                    ),
+                );
+                fs::remove_file(&path).unwrap();
+                println!("{} Checksum failed: {}", Status::error(), dest.red());
+                return false;
+            }
+        }
+
+        println!(
+            "{} {}: {}",
+            Status::success(),
+            if expected_md5.is_some() {
+                "Verified"
+            } else {
+                "Downloaded"
+            },
+            dest
+        );
+
+        return true;
     }
-    
-    println!("{} {}: {}", 
-        Status::success(), 
-        if expected_md5.is_some() { "Verified" } else { "Downloaded" }, 
-        dest
+
+    log_error(log_file, &format!("All CDNs failed for {}", dest));
+    println!("{} All CDNs failed for {}", Status::error(), dest.red());
+    false
+}
+
+fn format_duration(duration: Duration) -> String {
+    let secs = duration.as_secs();
+    let hours = secs / 3600;
+    let minutes = (secs % 3600) / 60;
+    let seconds = secs % 60;
+
+    format!("{:02}:{:02}:{:02}", hours, minutes, seconds)
+}
+
+fn update_title(start_time: Instant, success: usize, total: usize) {
+    let elapsed = start_time.elapsed();
+    let elapsed_str = format_duration(elapsed);
+    let progress = if total > 0 {
+        format!(" ({}%)", (success as f32 / total as f32 * 100.0).round())
+    } else {
+        String::new()
+    };
+
+    let title = format!(
+        "Wuthering Waves Downloader - Elapsed: {} - {}/{} files{}",
+        elapsed_str, success, total, progress
     );
-    
-    true
+
+    set_title(&title).unwrap();
 }
 
 fn main() {
-    set_title("Wuthering Waves Downloader").unwrap();
-    clear().unwrap();
-    
+    let log_file = setup_logging();
     let client = Client::new();
+
+    let config = match get_predownload(&client) {
+        Ok(c) => c,
+        Err(e) => {
+            log_error(&log_file, &e);
+            clear().unwrap();
+            println!("{} {}", Status::error(), e);
+            println!("\n{} Press Enter to exit...", Status::warning());
+            let _ = io::stdin().read_line(&mut String::new());
+            std::process::exit(1);
+        }
+    };
+
     let folder = get_dir();
-    println!("\n{} Download folder: {}\n", Status::info(), folder.display().to_string().cyan());
-    
-    let data = fetch_index(&client);
+    clear().unwrap();
+    println!(
+        "\n{} Download folder: {}\n",
+        Status::info(),
+        folder.display().to_string().cyan()
+    );
+
+    clear().unwrap();
+    let data = fetch_index(&client, &config, &log_file);
+
     let resources = match data.get("resource").and_then(Value::as_array) {
         Some(res) => res,
         None => {
+            log_error(&log_file, "No resources found in index file");
             println!("{} No resources found in index file", Status::warning());
             println!("\n{} Press Enter to exit...", Status::warning());
             let _ = io::stdin().read_line(&mut String::new());
             return;
         }
     };
-    
-    println!("{} Found {} files to download\n", Status::info(), resources.len().to_string().cyan());
+
+    println!(
+        "{} Found {} files to download\n",
+        Status::info(),
+        resources.len().to_string().cyan()
+    );
     let success = Arc::new(std::sync::atomic::AtomicUsize::new(0));
     let total_files = resources.len();
     let folder_clone = folder.clone();
-    
+
+    let start_time = Instant::now();
+
     let success_clone = success.clone();
+    let title_thread = thread::spawn(move || {
+        loop {
+            update_title(
+                start_time,
+                success_clone.load(std::sync::atomic::Ordering::SeqCst),
+                total_files,
+            );
+            thread::sleep(Duration::from_secs(1));
+        }
+    });
+
+    let success_clone = success.clone();
+    let log_file_clone = log_file.try_clone().unwrap();
+
     ctrlc::set_handler(move || {
         clear().unwrap();
         println!("{} Download interrupted by user", Status::warning());
         let success_count = success_clone.load(std::sync::atomic::Ordering::SeqCst);
-        print_results(success_count, total_files, &folder_clone);
+
+        let title = if success_count == total_files {
+            " DOWNLOAD COMPLETE ".on_blue().white().bold()
+        } else {
+            " PARTIAL DOWNLOAD ".on_blue().white().bold()
+        };
+
+        println!("\n{}\n", title);
+        println!(
+            "{} Successfully downloaded: {}",
+            Status::success(),
+            success_count.to_string().green()
+        );
+        println!(
+            "{} Failed downloads: {}",
+            Status::error(),
+            (total_files - success_count).to_string().red()
+        );
+        println!(
+            "{} Files saved to: {}",
+            Status::info(),
+            folder_clone.display().to_string().cyan()
+        );
+        println!("\n{} Press Enter to exit...", Status::warning());
+
+        let mut input = String::new();
+        io::stdin().read_line(&mut input).unwrap();
+
+        log_error(
+            &log_file_clone,
+            &format!(
+                "Download interrupted by user. Success: {}/{}",
+                success_count, total_files
+            ),
+        );
         std::process::exit(0);
-    }).unwrap();
-    
-    for (i, item) in resources.iter().enumerate() {
+    })
+    .unwrap();
+
+    for item in resources.iter() {
         if let Some(dest) = item.get("dest").and_then(Value::as_str) {
-            print!("{} ", format!("[{}/{}]", i+1, resources.len()).magenta());
             let md5 = item.get("md5").and_then(Value::as_str);
-            if download_file(&client, dest, &folder, md5) {
+            if download_file(&client, &config, dest, &folder, md5, &log_file) {
                 success.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
             }
         }
     }
-    
-    print_results(success.load(std::sync::atomic::Ordering::SeqCst), total_files, &folder);
+
+    drop(title_thread);
+
+    print_results(
+        success.load(std::sync::atomic::Ordering::SeqCst),
+        total_files,
+        &folder,
+    );
 }
 
 fn print_results(success: usize, total: usize, folder: &Path) {
@@ -208,11 +667,23 @@ fn print_results(success: usize, total: usize, folder: &Path) {
     } else {
         " PARTIAL DOWNLOAD ".on_blue().white().bold()
     };
-    
+
     println!("\n{}\n", title);
-    println!("{} Successfully downloaded: {}", Status::success(), success.to_string().green());
-    println!("{} Failed downloads: {}", Status::error(), (total - success).to_string().red());
-    println!("{} Files saved to: {}", Status::info(), folder.display().to_string().cyan());
+    println!(
+        "{} Successfully downloaded: {}",
+        Status::success(),
+        success.to_string().green()
+    );
+    println!(
+        "{} Failed downloads: {}",
+        Status::error(),
+        (total - success).to_string().red()
+    );
+    println!(
+        "{} Files saved to: {}",
+        Status::info(),
+        folder.display().to_string().cyan()
+    );
     println!("\n{} Press Enter to exit...", Status::warning());
     let _ = io::stdin().read_line(&mut String::new());
-}
\ No newline at end of file
+}