In Dungeon Siege III: Treasures of the Sun, players will extend their journey and travel beyond the borders of Ehb to an all-new environment: the Aranoi Desert. On their search for a lost Legion hero, players will fight through hordes of new villains only to find a forgotten abbey hiding a long-lost secret: the greatest treasure of the Azunite faith.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.