The purchased product key must be activated in Steam:
- 1) Go to https://store.steampowered.com/ and click on the green button that says "Install Steam".
- 2) Install and run the Steam client and log in with your existing account or create a new one.
- 3) Click "Add Game" at the bottom left corner of the screen and then select "Activate a Product on Steam"
- 4) The "Product Activation" window will pop up. Follow the onscreen instructions and enter your purchased code.
- 5) Once the activation is complete, you can find the new game in your "Library" tab.
- 6) Press the blue "Install" button to install the game.
