Type or paste the key exactly as provided. Use capitals; hyphens are optional but help avoid typos. Example format: XXXXX-XXXXX-XXXXX
Steam will recognize the key as Arma 2: Reinforcements . It will immediately begin downloading approximately 8-12 GB of data. arma+2+reinforcements+cd+key+updated
In the top-left corner, click Games -> Activate a Product on Steam . Type or paste the key exactly as provided