Customize your squad with three new bonus items. Instantly unlock a new recruit in your barracks inspired by the original X-COM: UFO Defense. Outfit your soldiers with specialized armor upgrades including the new Hyperion and Reaper soldier armor kits. Customize your soldiers’ appearances with a variety of colors and tints for all armor sets. Note: The Elite Soldier Pack was included in the pre-purchase offer of XCOM: Enemy Unknown.

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.