Children of the Worm features a brand-new Campaign story – Act 5 that puts you into an epic showdown with a fierce new enemy threat. To help combat this unknown adversary, this expansion will introduce “Prophet” Dan, a gun-toting, self-proclaimed preacher of the end times, who joins our growing list of Cleaners in their effort to save humanity. Children of the Worm also includes exclusive character skins, exclusive weapon skins, along with new weapons, accessories, and cards. Expansion 2 includes: New Campaign Story – Act 5 New Playable Cleaner: “Prophet” Dan New Enemy Threat 8 Exclusive Pre-Collapse Character Skins 12 Exclusive 8-Bit Weapon Skins New Weapons, Accessories, Cards + More

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 "LIBRARY" tab and start downloading.