Sometimes the serial number is missing from your Windows Registry, causing the game to prompt you every time. Press Win + R , type , and hit Enter.
Enter your legitimate product key (e.g., ABC1DEF2GHI3JKL4MNO5) and click OK .
Click and then OK . Launch the game directly from the folder. Method 2: Manually Enter the Key via Registry Editor
However, if you’ve recently dusted off your old DVD copy or bought a digital key from a third-party site, you might have run into a frustrating wall: the serial number activation problem. You type in your code, hit enter, and… nothing. Or worse, the game tells you the key is invalid or already in use.
If you receive an "Activation Limit Exceeded" error, the license has been used too many times on different machines. Go to the EA Help Contact page.
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Electronic Arts\Electronic Arts\Shift 2 Unleashed\ergc
: If you own the game on Steam and have serial number issues, try redeeming the CD key directly in the EA app . Users have reported that the EA app version sometimes bypasses the older Solidshield DRM limits found on Steam.