How To Activate Your Game Product Code Key With Social Club?

Open your Rockstar Games Social Club client or use a web browser to navigate here: http://socialclub.rockstargames.com/activate
Log in to your Social Club account, or create a new one if you don’t already have one.
Select “Use Rockstar Code”, and then use the key you received in your confirmation email.
Select “Confirm” and then follow the prompts to download and install the game on your PC. You can find additional support with the Rockstar Social Club here: https://support.rockstargames.com/