As of 2022/09/15, iRacing supports Windows 10 and Windows 11.

Support for Windows 8.1 will be ending with the 2023 Season 2 release in March of 2023.

If you are presented with an error message indicating your operating system is unsupported, but you are running Windows 10 or Windows 11, then the executable may be flagged for compatibility mode.

This is not on be default and should not be common. But if you are in this situation, you can resolve this by taking the following steps.

  1. Navigate to where iRacing is installed. By default, this is C:\Program Files (x86)\iRacing\ui
  2. Right-click on the iRacingUI.exe and select properties
  3. Click on the Compatibility tab
  4. Uncheck the box labeled Run this program in compatibility mode for