The gifts of the Outsider are bestowed unto those who walk the Void. With the Void Walker’s Arsenal add-on pack, gain immediate access to four content bundles previously available only through pre-ordering Dishonored. The Acrobatic Killer Pack, Arcane Assassin Pack, Backstreet Butcher Pack and Shadow Rat Pack offer unique character bonuses, additional bone charm slots, unhidden books and bonus coins that will aid you in your pursuit of revenge. Found in the Hound Pits Pub, use these items to enhance your playthrough of Corvo’s main campaign in the original game.

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.