1. Download and install Steam http://steampowered.com/download/SteamInstall.msi, register your account on Steam.
2. Start the Steam client, log in to your account and click the "Add game - activate via Steam" button and follow the instructions. After activation, the game appears in the list of games and you can download it.
If you have additional questions, contact the seller in the online chat or write to e-mail.
Attention! The seller is only responsible for the activation of the key or the gilt! And is not responsible for technical problems when starting, in-game and non-compliance of PC and system parameters. All such problems are solved through official technical support of publishers.