: If you get an "Invalid Serial" error instead, try adding dashes back into the key (e.g., XXXX-XXXX-XXXX-XXXX-XXXX ) as some versions require them for validation. Automated Tools for Modern Systems
We will solve this in three stages. Try them in order. command and conquer generals serial key already in use
This article will dissect exactly why this error occurs, why your legitimate key is being rejected, and provide a definitive, step-by-step guide to fixing it. : If you get an "Invalid Serial" error