This DLC unlocks a folder inside the game location that contains: Behind the scenes. Screenshots of the under-development build of The Alien Cube compared to the final version. Under-development video. Wallpapers. To access the DLC:Right-click the game in your Steam Library -> Manage -> Browse Local Files

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 "LIBRARY" tab and start downloading.