Corrupt data from a patch is the leading cause of this error. Verifying your files compares your local installation with the official servers and replaces any broken items. Launch Steam and navigate to your Library .
Your antivirus might be eating the anti-cheat driver. age of empires 2 definitive edition tampering detected
Even if a mod worked perfectly yesterday, an official game update can turn an innocent visual tweak into a "tampering" trigger. Launch the game (if it allows you to reach the main menu). Corrupt data from a patch is the leading cause of this error
Follow these solutions in order. Start with the easiest (Verifying files) and move to the advanced fixes only if necessary. age of empires 2 definitive edition tampering detected