Many old tutorials tell you to right-click Assetto Corsa in Steam -> Properties -> Betas -> Select "v1.16.3 - public". If you roll back your Steam version to 1.16.3, you will lose compatibility with modern CSP and almost all 2024/2025 mods (No Hesi, SRP, etc.). This is usually the wrong move.
Assetto Corsa stopped receiving official content updates years ago, with (the "Bonus Pack 3" update) being the final official stable build released by Kunos Simulazioni. Because the modding community (via Content Manager Custom Shaders Patch
An outdated or corrupted Custom Shaders Patch (CSP) installation can trigger version warnings during the handshake between the launcher and the game engine. How to Fix the "Obsolete" Error
When Kunos Simulazioni stopped updating the original Assetto Corsa (AC) to move on to Assetto Corsa Competizione , the game was left in a solid, but technically dated state. assetto corsa is obsolete v1.16.3 is required
is obsolete (v1.16.3 is required)" is a confusing ghost from the past that suddenly haunts a modern setup. This error typically appears within or the Custom Shaders Patch (CSP) settings. While it sounds like your game is ancient, the reality is often the opposite: your game is actually too new for the mod's current detection logic. Why the Error Happens
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?
to join. Please update via Steam and restart Content Manager before trying to reconnect." Option 3: The "Modder’s Note" (Technical Context) Many old tutorials tell you to right-click Assetto
The final, simplest approach is often to do nothing. The error message itself does not always prevent the game from functioning correctly. In many cases, players can simply click through the warning and continue with their session. Additionally, CSP developers typically release updates to incorporate new version numbers, ensuring that the patch is updated to understand future releases. As one community member noted, the error did not appear to cause any functional issues in their testing.
The requirement for v1.16.3 means that players who are still running older versions of the game will no longer be able to access online multiplayer, matchmaking, and other features. This will inevitably lead to a fragmented community, with some players being forced to upgrade to the latest version, while others will be left behind.
While annoying for a newcomer, the requirement for v1.16.3 highlights a unique phenomenon in gaming. Unlike other titles that die when the developer stops updating them, Assetto Corsa was taken over by the community. is obsolete (v1
This guide breaks down exactly why this error happens and how to fix it in minutes. Why This Error Happens
Some versions of CSP are hard-coded to look for exactly version 1.16.3 . When Kunos (the developer) released minor subsequent updates—like v1.16.4—CSP sometimes failed to recognize it as a valid, newer version and flagged the game as "obsolete".
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