diff --git a/Cargo.lock b/Cargo.lock
index f4fd669..f8ffd6f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -41,6 +41,7 @@ dependencies = [
  "steamlocate",
  "strip-ansi-escapes",
  "tokio",
+ "walkdir",
  "winresource",
 ]
 
@@ -1383,6 +1384,15 @@ version = "1.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f91339c0467de62360649f8d3e185ca8de4224ff281f66000de5eb2a77a79041"
 
+[[package]]
+name = "same-file"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "scc"
 version = "2.1.16"
@@ -1996,6 +2006,16 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "walkdir"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
+dependencies = [
+ "same-file",
+ "winapi-util",
+]
+
 [[package]]
 name = "want"
 version = "0.3.1"
@@ -2147,6 +2167,15 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
+dependencies = [
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
diff --git a/Cargo.toml b/Cargo.toml
index 738e711..20e9175 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,6 +23,7 @@ futures-util = "0.3.31"
 indicatif = "0.17.11"
 tokio = { version="1.43.0", features = ["rt-multi-thread", "macros"] }
 simple-log = "2.1.1"
+walkdir = "2.5"
 
 [target.'cfg(unix)'.dependencies]
 openssl = { version = "0.10.71", default-features = false, features = ["vendored"] }
diff --git a/src/main.rs b/src/main.rs
index 9411c5a..6aa8d3b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -26,7 +26,7 @@ use mslnk::ShellLink;
 use simple_log::LogConfigBuilder;
 use std::{
     borrow::Cow,
-    collections::HashMap,
+    collections::{HashMap, HashSet},
     env, fs,
     path::{Path, PathBuf},
 };
@@ -388,56 +388,44 @@ async fn update(
     if game.engine == "iw4" {
         iw4x::update(dir, &mut cache, prerelease).await;
 
-        let iw4x_dirs = vec!["iw4x", "zone/patch"];
-        for d in &iw4x_dirs {
-            if let Ok(dir_iter) = dir.join(d).read_dir() {
-                'outer: for file in dir_iter.filter_map(|entry| entry.ok()) {
-                    let file_path = file.path();
+        let scan_dirs = ["iw4x", "zone/patch"];
+        let valid_files: HashSet<_> = cdn_info
+            .iter()
+            .filter_map(|cdn_file| {
+                if cdn_file.name.starts_with("iw4/") || cdn_file.name.starts_with("iw4-dlc/") {
+                    Some(Path::new(&cdn_file.name).to_path_buf())
+                } else {
+                    None
+                }
+            })
+            .collect();
 
-                    if file_path.is_dir() {
-                        continue;
-                    }
+        for scan_dir in scan_dirs.iter() {
+            let full_scan_dir = dir.join(scan_dir);
+            if !full_scan_dir.exists() || !full_scan_dir.is_dir() {
+                continue;
+            }
 
-                    let file_path_rel = match file_path.strip_prefix(dir) {
-                        Ok(rel) => rel.to_path_buf(),
-                        Err(_) => continue,
-                    };
+            for entry in walkdir::WalkDir::new(&full_scan_dir)
+                .into_iter()
+                .filter_map(Result::ok)
+                .filter(|e| e.file_type().is_file())
+            {
+                let rel_path = entry.path().strip_prefix(dir).unwrap_or(entry.path());
+                let cdn_path = if rel_path.starts_with("iw4-dlc") {
+                    rel_path.to_path_buf()
+                } else {
+                    Path::new("iw4").join(rel_path)
+                };
 
-                    if iw4x_dirs
-                        .iter()
-                        .any(|prefix| file_path_rel.starts_with(Path::new(prefix)))
-                    {
-                        if !cdn_info
-                            .iter()
-                            .any(|cdn_file| cdn_file.name.starts_with("iw4"))
-                        {
-                            continue;
-                        }
-
-                        let should_continue = cdn_info.iter().any(|cdn_file| {
-                            let path_rem = Path::new(&cdn_file.name)
-                                .strip_prefix(Path::new("iw4"))
-                                .unwrap_or_else(|_| Path::new(&cdn_file.name));
-                            path_rem == file_path_rel
-                        });
-
-                        if should_continue {
-                            continue 'outer;
-                        }
-
-                        crate::println_info!(
-                            "{}{}",
-                            misc::prefix("removed"),
-                            file_path.cute_path()
+                if !valid_files.contains(&cdn_path) {
+                    crate::println_info!("{}{}", misc::prefix("removed"), entry.path().cute_path());
+                    if std::fs::remove_file(entry.path()).is_err() {
+                        crate::println_error!(
+                            "{}Couldn't delete {}",
+                            misc::prefix("error"),
+                            entry.path().cute_path()
                         );
-
-                        if fs::remove_file(&file_path).is_err() {
-                            crate::println_error!(
-                                "{}Couldn't delete {}",
-                                misc::prefix("error"),
-                                file_path.cute_path()
-                            );
-                        }
                     }
                 }
             }