If problems persist, you can select and perform a clean reinstall of CSP through Content Manager.
Certain mods or manual file changes (like editing acs.pdb ) can trigger version-check failures. How to Fix the "Obsolete" Error 1. The Quick "Changelog" Fix assetto corsa is obsolete v1.16.3 is required
“assetto corsa is obsolete v1.16.3 is required” If problems persist, you can select and perform
Do not attempt to preserve older versions for “compatibility” with outdated mods. Update to 1.16.3 immediately. Most legacy content works correctly after updating; any that doesn’t is likely abandoned and not worth keeping. Staying obsolete will lock you out of the living Assetto Corsa ecosystem. If problems persist
The error message is a common technical hurdle for sim racers using third-party tools like Content Manager (CM) or the Custom Shaders Patch (CSP) .