Click in the top menu and select "Activate a Product on Steam..." . Enter your original retail CD key.
: A unique 25-character code (formatted as XXXX-XXXX-XXXX-XXXX-XXXX) required to activate the game. Historically, this was found on the back of the game manual or the physical case. Click in the top menu and select "Activate
While the terms are often used interchangeably, they served distinct roles during the game’s original release: Click in the top menu and select "Activate
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\THQ\Company of Heroes (or WOW6432Node on 64-bit systems). Look for the entry titled . Purchasing a Digital Key Click in the top menu and select "Activate
If you do not own a physical copy, you can purchase a digital key from various retailers: Can't connect to relic online?? :: Company of Heroes