This pack includes Map Targul for Survival Mode. After installing DLC you will find a new button in the main menu of the Game - Survival. After that : Click on this menu button. Choose the Targul button in the opened window with the list of Maps. When map opens, just play.

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.