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Asset Bundle Version Mismatch - Unturned Wiki

Unturned Guide • Updated Jan 22, 2026

Fix Unturned Asset Bundle Version Mismatch

The "Asset bundle version mismatch" error happens when the server and client load different Workshop versions of the same mod. This guide covers the fastest fixes and how to prevent repeat mismatches.

Most Common Causes

  • Server has not restarted to download the newest Workshop update
  • Client workshop cache is corrupted or stale
  • Server is missing a dependency or child Workshop item

Quick Fix (Players)

  1. Close Unturned and Steam.
  2. Unsubscribe from the mod(s) listed in the error.
  3. Delete the mod folder in Steam/steamapps/workshop/content/304930.
  4. Restart Steam and re-subscribe.
  5. Launch Unturned and let the Workshop update fully download.

Server Owner Fix

  1. Stop the server.
  2. Delete the server's Workshop folder (this forces a clean re-download).
  3. Verify WorkshopDownloadConfig.json contains the correct File_IDs.
  4. Restart the server and wait for all mods to download before players join.

WorkshopDownloadConfig.json Example

{
  "File_IDs": [123456789, 987654321],
  "Ignore_Children_File_IDs": [],
  "Should_Monitor_Updates": true
}

Tip: If a mod has dependencies (child items), make sure they are included in the File_IDs list or allowed via child downloads.

Advanced Troubleshooting

  • Check server logs: The console will usually print the offending Workshop ID.
  • Compare update timestamps: A mod updated minutes ago may require a restart.
  • Test without the mod: Remove one mod at a time to isolate the mismatch.

Prevention Checklist

For Server Owners

  • Restart the server after major Workshop updates.
  • Use a Steam Collection so players always subscribe to the correct mod list.
  • Keep a copy of WorkshopDownloadConfig.json in version control.

For Players

  • Let Workshop downloads finish before joining.
  • Avoid manual edits inside Workshop folders.
  • Clear cache if you frequently join multiple modded servers.

Keep your Unturned server and client mods synchronized to prevent version mismatch errors and ensure smooth multiplayer gameplay.

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