If you are a sim racer who has spent countless hours modding Assetto Corsa , you have likely encountered a frustrating roadblock: a pop-up window declaring, "Assetto Corsa is obsolete: v1163 is required to join this server."
You open Steam, right-click Assetto Corsa > Properties > Local Files > Verify integrity of game files. Steam tells you: "Successfully validated 100% of files." You launch the game, yet the error persists.
By following the steps above—nuking the install, manually replacing steam_api.dll , and correctly configuring Content Manager—you will silence the "v1163 required" error forever. Keep racing, keep modding, and never let a version mismatch keep you off the grid. Need more help? Drop a comment below with your specific mod list and CSP version. The fix is almost always one of the five steps above.
This error appears deceptively simple but can be a nightmare to troubleshoot. It prevents you from joining online races, locks you out of leagues, and makes it seem like your game is permanently broken.
