If you've received a complimentary copy of Angry Birds Rio PC
  1. Download Angry Birds Rio from here
  2. Install the game
  3. Click "Activate Full Version" button inside the game and enter your promotional code
  4. Enter your promo code and PLAY!
If you're looking for the main download page for all Angry Birds PC games, please go here.
Minimum System Requirements:

OS Windows XP SP2
RAM 512MB
CPU 1 GHz
Graphic OpenGL 1.3 compatible
Internet Connection required for activation