If you see this error again, don't panic. Don't uninstall. Just open Content Manager, update your CSP, and spoof the number. You’ll be back on the Nordschleife in traffic within two minutes.
For the casual driver, this error is confusing. You bought the game on Steam. It updates automatically. How can it be "obsolete"? Why is it asking for a version number that doesn't seem to exist in your Steam library? And most importantly: assetto corsa is obsolete v1.16.3 is required
As CSP evolved, modders started building features that required specific CSP versions. Eventually, server hosts began using a feature within CSP that checks the . If you see this error again, don't panic
If you check your Steam properties, the final public build of Assetto Corsa (including all DLC) is (or v1.16.3 for some legacy branches). Kunos Simulazioni stopped developing the title years ago to focus on Assetto Corsa Competizione . So why is a server demanding a version that is lower than the current Steam build? You’ll be back on the Nordschleife in traffic
Here is the catch: Modern versions of CSP (specifically versions 0.2.0 and above) trick the game into reporting a fake version number to the server to ensure compatibility. Specifically, many server configs look for because that was the last stable "vanilla" version before CSP fundamentally altered the netcode.