Pirated versions rarely receive updates and often fail version checks. The only reliable fix is to , install the genuine version, and let it update to 1.16.3.
You are running the vanilla game without Custom Shaders Patch. The server is running a custom physics script or track layout that only exists via CSP. Because you lack CSP, your game reports "1.16.4" (real Steam version). The server expects the CSP-coded "1.16.3". Result: Obsolete error.
Many users have found that manually updating the version text file solves the reporting error instantly:
This is the magic trick. CSP allows you to lie to the server about your version to maintain compatibility.
Check for updates and install the latest "Recommended" or "Tested" version.
Old versions of CSP may not be compatible with newer Steam updates. In Content Manager, go to > Custom Shaders Patch .