The controversy over the Superhuman Registration Act has led to the unfathomable Super Hero Civil War. Choose between Iron Man, who leads the SRA's supporters, and Captain America, who sees it as a threat to personal liberties, as you assemble your team and experience one of the most dramatic conflicts in the Marvel Universe.

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.