1. Go to: http://www.origin.com/us/about . 
Click "Download Origin" (from the upper left corner)
Download Origin 2.  Install and start application, login with your Account name and Password
(create one here: http://store.origin.com/ if you don't have). 3. From the "Origin" drop-down menu (upper left corner) choose "Redeem Product Code...",
enter your code and click "Next". 4. After successful code verification go to the "MY GAMES" tab and start downloading.