Update your GPU drivers and ensure Windows Developer Mode is on.

This blog post addresses a specific issue faced by Forza Motorsport 7 (FM7) players on Windows 10/11, particularly those using modified or "generic UWP" versions that often arrive in a packed .rar format. Fix: Forza Motorsport 7 (FM7) UWP Generic RAR Errors

Ensure you are on the latest version of Windows 10 or 11.

Disclaimer: This guide is for troubleshooting legitimately owned software that has been repacked. Ensure your software usage complies with the EULA. To make this guide more effective, could you tell me: What or code are you seeing (if any)? Did the RAR package include a script.bat or fix.ps1 file? I can provide the specific commands for your situation.