Locate your Command & Conquer 4 installation directory (e.g., C:\Program Files (x86)\Steam\steamapps\common\Command and Conquer 4 Tiberian Twilight ).
C:\Users\[Username]\AppData\Roaming\Command & Conquer 4\Maps\ Method 3: The Maximum Progression Registry Fix Locate your Command & Conquer 4 installation directory (e