If you have a retail or non-Steam digital version and need to locate your unique product key, there are several ways to find it depending on your installation: Physical Box: For retail copies of Arma 2: Reinforcements
Keys purchased through the Bohemia Store or other retailers are typically provided as Digital Steam Versions and must be activated via the "Activate a Product on Steam" menu. Troubleshooting Common Errors arma+2+reinforcements+cd+key+updated
To play Arma 2 Reinforcements, players need to activate the game using a valid CD key. The CD key is a unique code that is required to unlock the game and access its online features. When purchasing the game, players receive a CD key that they can use to activate the game on their computer. If you have a retail or non-Steam digital
: You can redeem your original retail or non-Steam CD key (found in the box manual or purchase email) directly on Steam. Open Steam, go to Activate a Product on Steam , and enter your code. When purchasing the game, players receive a CD
If you already own Arma 2: Operation Arrowhead , buying a Reinforcements key for more than $15 is not worth it unless you are a military simulation purist or a mod developer. The assets are dated, and the player base is tiny.