Activating (the original 2011 version) can be tricky due to its aging DRM and the transition from older EA services to the current EA app. Depending on whether you have a physical copy, a Steam version, or a digital key, here is how to handle activation and common "invalid key" errors. Where to Activate Your Key The EA App: Most retail or digital keys can be redeemed directly in the (formerly Origin). Steam to EA App:
If the game refuses to accept your product key or asks for it every time you launch, try these community-verified fixes: Run as Administrator: crysis 2 product activation key
If you get a "Serial already in use" error, try entering the key without any dashes 1234567890 instead of 1234-5678-90 ). Some users have also found success using all lowercase letters with dashes. Clear the License Cache: Activating (the original 2011 version) can be tricky