Centered on a truck stop on a Georgia highway, The Walking Dead – 400 Days is a DLC episode for Season One of Telltale’s award-winning game series. 400 Days tells five linked stories; each taking place at different points in time and from the point of view of a different survivor, from day one of the undead apocalypse to day 400.The five stories can be played in any order and will change based on the choices that you make. Echoes of the choices you made in Season 1 will carry over into 400 Days and the choices you make in 400 Days will resonate into Season 2.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.