Premium edition upgrade includes Dark Side Cookies bonus DLC that features: Clot of Darkness amulet providing bonus to money and experience Two additional locations Over a dozen additional quests and a new unit Please note: Owners of Premium edition have this DLC already. Please note: You'll need to start a new game to create the game world with new content. If you continue a save started in regular edition, premium content won't be available.

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.