You need Assetto Corsa v1.16.3 to run whatever mod or server requires it; this guide shows how to check your version, update safely, fix common update errors, and ensure mods/servers work with v1.16.3.
The Text File Trick: Open assettocorsa/changelog.txt and change the top version number to 1.16.3. This is the most common "quick fix" that tricks the mod into thinking the version matches. assetto corsa is obsolete v1.16.3 is required fix
The confusion stems from the phrasing of the error itself. When a user sees "obsolete," the natural assumption is that their software is outdated and requires an update to a newer version. However, in the context of Assetto Corsa modding, the opposite is often true. Version 1.16.3 represents the final official update released by Kunos Simulazioni before they shifted their full focus to Assetto Corsa Competizione. Consequently, when the game throws this error, it is usually signaling a version mismatch caused by Steam’s automatic updating system conflicting with the requirements of third-party mods. Quick summary You need Assetto Corsa v1
Title: [FIX] Assetto Corsa Error: "Game is obsolete (v1.16.3 is required)" The confusion stems from the phrasing of the error itself
Rename it to something like AcTools Content Manager_Backup (this keeps your settings safe).
Find the exact folder path if you aren't sure where Steam installed it.
What's new in version 1.16.3?