Follow a gripping, surprise-filled journey as two dissimilar characters form an uneasy partnership in order to survive through a perilous, post-apocalyptic America. 150 years in the future, war and destruction have left the world in ruins with few humans remaining and nature having reclaimed the world.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.