Unsupported Game Version detected - How to downgrade your game

Last update: 17 Sep 16:22 UTC
Short link to this article: https://truckersmp.com/kb/26

Unsupported Game Version detected

If you have the error shown below, this article will help you downgrade your game to the correct version of ATS or ETS2.

Unsupported Game Version

Whenever American Truck Simulator or Euro Truck Simulator 2 is updated by SCS you will need to downgrade your game until TruckersMP pushes an update to support the new version.
Updating TruckersMP to the new version may take some time, we also do not have an average waiting time for the new updates. Once we support the newest version, it will be posted on our socials and our Discord.

To upgrade/downgrade ATS or ETS 2 you need to open Steam. After doing that follow these steps:
You can also watch this video on how to downgrade your game.

  1. Open your Library
  2. Right-click on ATS / ETS 2
  3. Open Properties...
  4. Head over to Betas

=> Here you need to find the correct version. If TruckersMP is fully updated and supports the new version, you need to select "NONE - Opt out of all beta programs".

For ATS select: NONE - Opt out of all beta programs

For ETS2 select: NONE - Opt out of all beta programs


-> If SCS updated the game you need to find the latest supported version by TruckersMP. You can find that version in the error message when you try to launch ATSMP / ETS2MP. After you know the supported version, try to search for that version in your Steam Settings.

Note: Downgrading your game isn't always possible. We recommend disabling automatic updates for both ATS and ETS2.

If your game already has the correct version

If your game already has the correct version but you still receive that error message, try to follow these steps:
As an example we will do this with ETS2. You can do the same with ATS and all ATS files/locations.

Step 1

  1. Open Steam and go to your Library
  2. Right-click on Euro Truck Simulator 2 and open Properties...
  3. After the Properties window has opened click on Local Files tab and press Browse Local Files...
  4. A folder with game files will open, then copy the path to this folder

Step 2

  1. Click Start -> Run (or WIN+R)
  2. Type regedit and hit enter
  3. Follow the path HKEY_LOCAL_MACHINE\SOFTWARE\TruckersMP
  4. Double click on InstallLocationETS2
  5. Paste the previously copied path in Value data:

If you still encounter problems, feel free to take a look at this topic or contact our Support Team here.

Need help opening a Support Ticket, take a look at this article.