In some cases, you may need to manually install the "KB4474419" update for Windows 7 to handle modern digital signatures. Performance Optimization Tips
Many players running Windows 7 have reported issues with the Dakar Desert Rally game and its DLCs. These issues include:
Ensure that you install the DLCs in the correct order:
If you need help getting the with DLCs working on Windows 7 (unsupported by developer Saber), that would require manual patching with compatibility tools or an unofficial fix — but that's technically not supported.