This is a niche but real fix. Age of Empires 2: DE uses a hash check on game files in RAM. If your RAM has a single-bit error due to an unstable overclock (XMP Profile), the hash changes. The game sees the changed hash and screams "Tampering."
Instructions for students
: Right-click the game in your Steam Library > Properties > Installed Files > Verify integrity of game files . age of empires 2 definitive edition tampering detected
If you're stuck with grayed-out menus or frequent crashes, try these community-vetted solutions: Age of Empires II: Definitive Edition Tech Issues & Support This is a niche but real fix
