This standalone retail title spans three distinct stories, interwoven to create one of the most unique and engaging single-player experiences of this generation. This definitive Grand Theft Auto bundle boasts hundreds of hours of single-player gameplay; a full suite of open-world multiplayer game types limited only by players’ creativity; dozens of eclectic radio stations with hours of music and original dialogue.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.