Buy Link Twin

For Steam CD Keys, you must download (HERE), install the Steam software and create a new account. If you already have a Steam account, once you log in, click "Add a game" (located in the bottom left corner), and then "Activate a Product on Steam". After a few more clicks, you will be prompted to type in your game code. Thus, the game will be activated and automatically added to your account library.

For the Battle.net platform, you need to login on Battle.net, HERE , or register if you don't have any account. Once logged in, click "Games & Codes" and "Add or Upgrade a Game". Then you'll have to fill in your CD Key, so you will be able to download the game anytime and on any computer, free of charge.