While you might see search results for a ".rar" fix file, be extremely cautious. Many community members warn that downloading third-party "fix" files from unofficial sites can be a security risk, often containing malware instead of actual solutions.
If your game won't start or crashes immediately, try these steps in order:
Watch Dogs – How to Fix Crash on Startup – Complete Tutorial
Instead, most launch errors in (1, 2, or Legion) can be solved using official methods and system adjustments. Recommended Fixes for Watch Dogs Launch Errors