Step 1: Download Rockstar Games Launcher
Download the Rockstar Games Launcher from the official Social Club website here: https://socialclub.rockstargames.com/rockstar-games-launcher
Once the launcher has downloaded, install it and open it.
You should now see a login window on the launcher.
If you already have an account the sign in, if you do not then simply click on ‘Create a new account’ in the top right corner.
Step 2: Activate Your Game
Once logged in, click on the round user icon in the top right corner and then select ‘Redeem Code’ in the top right corner.
In the new window enter your activation code. Click ‘Check’ to verify the code, and then ‘Confirm’ to redeem it and add the game to your account.
Step 3: Download Your Game
On the left hand side you should see a list for ‘My library’ and your game should appear under it. Click on the game and then click the button that says “Install Now”.
Once the game has downloaded/installed you will be able to play!