GOG CD Key Please create an account or login on https://www.gog.com Go to http://www.gog.com/redeem Enter the code and then press "CONTINUE" After a short amount of time you will see the details about the product, please press "CONTINUE" again. Download and install the GOG.com downloader Login to the software and get back to the product page Go to https://www.gog.com/account and look for the "Games" tab. Press the box of the product you want to download. Activate the GOG.com Download Mode on the right side of product menu. Choose the installation package from the list and save it with the GOG Downloader. Steam CD Key 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.