Here are the most effective ways to resolve this issue and get back on the track. 1. Verify Game Integrity on Steam
Troubleshooting: " Assetto Corsa is Obsolete (v1.16.3 is Required)" Fix
The most reliable way to ensure your game is actually on version 1.16.3 is to use Steam's built-in repair tool. Open your . Right-click on Assetto Corsa and select Properties . Navigate to the Installed Files (or Local Files ) tab.