Embody the four powerful bosses – Azexez, Count Carlyle, Ludmilla, and Azh-Rafir – in Quick Battle, online or offline Multiplayer modes. Master their four new spells: Azexez's Demon Portal, Ludmilla's Spider Swarm, Count Carlyle's Bile Blast and Azh-Rafir's Palm Blast!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.