BioShock Infinite - Clash in the Clouds DLC PC Steam CD Key (MAC OS X)

This first add-on pack puts an intense focus on BioShock Infinite® combat. Combine weapons, Vigors, Gear, Tears and Sky-Lines in ways you never thought possible as you square off against impossible odds. This pack features 60 challenges in 4 brand-new maps. Complete Blue Ribbon Challenges and unlock concept art, Voxophones, Kinetoscopes, and more in The Columbian Archeological Society. Please note: Add-on Content, BioShock Infinite® required to play. This content is NOT part of the BioShock Infinite Season Pass

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.