This error message (Failed to start Denuvo driver) usually means the anti-tamper software (Denuvo) used by Football Manager 2018 cannot communicate with a required system driver. This is often caused by Windows Security settings, outdated drivers, or software conflicts.
Navigate to Troubleshoot > Advanced Options > Startup Settings > Restart. football manager 2018 failed to start denuvo driver
Sometimes, the issue isn't Windows; it's the game itself. If a power outage or a bad installation corrupted the Denuvo driver file, the game won't know how to launch. Steam has a built-in tool to fix this. This error message ( Failed to start Denuvo