R.E.P.O. BepInEx mods not installing correctly [FIXED].

If BepInEx mods for R.E.P.O. fail to install, verify correct file placement in the game directory, ensure version compatibility with BepInEx 5.4.21 for Unity 2019 builds, manually place DLLs in the plugins folder, check LogOutput.log for errors, and disable antivirus or Steam Overlay interference.

If BepInEx mods for R.E.P.O. are not installing correctly, the issue may stem from incorrect file placement or version mismatches. Here are several solutions to resolve this.

The operating environment of this tutorial: ASUS ROG Zephyrus G14, Windows 11

1. Verify BepInEx Installation Path

Incorrect installation paths are a common cause of mod loading failures. R.E.P.O. must locate the BepInEx core files at startup, which requires them to be placed in the correct game directory.

• Navigate to your R.E.P.O. installation folder, typically located under Steam\steamapps\common\R.E.P.O.
• Ensure that folders like BepInEx, plugins, and config exist in the root directory
• If missing, reinstall BepInEx using the official BepInEx pack for Unity games and extract all contents directly into the game folder

2. Match BepInEx and Game Version

BepInEx must be compatible with the current version of R.E.P.O. Mismatched versions can prevent the mod loader from initializing.

• Check the exact version of R.E.P.O. via Steam properties or the main menu
• Download the corresponding BepInEx version from the official GitHub repository
• Use BepInEx 5.4.21 if running a Unity 2019-based build, which is common for early access titles like R.E.P.O.
• Reapply the BepInEx patcher tool to ensure all DLLs and configuration files are properly injected

3. Manually Install Plugin DLLs

Some mods fail to load if their DLLs are not placed correctly. Manual installation ensures full control over plugin deployment.

• Place each mod’s DLL file into the BepInEx\plugins folder
• Do not place mods inside subfolders unless specified by the mod author
• Confirm the DLL was compiled for Any CPU or x64 to match the R.E.P.O. executable
• Use a tool like dnSpy to inspect the DLL if loading errors persist

4. Check Log Files for Errors

BepInEx generates detailed logs that can pinpoint why a mod fails to load. These logs are essential for diagnosing silent failures.

• Open the BepInEx\LogOutput.log file after launching the game
• Search for entries containing [Error] or Failed to load
• Look for missing dependencies such as Mono.Cecil or UnityEngine.CoreModule
• Install required dependency mods if indicated in the log

5. Disable Antivirus and Steam Overlay

Security software and overlays may block DLL injection or file access, interfering with mod loading.

• Add the R.E.P.O. game folder to your antivirus exclusion list
• Temporarily disable Windows Defender Real-Time Protection during installation
• Turn off the Steam Overlay in the game’s properties menu
• Run the game as administrator to ensure full file system access

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