1. Install steam client software.
2. Launch the Steam client software and log into your Steam account.
Click the + add game (lower left of the steam software).
3. Choose Activate a product on steam.
4. Follow the given instruction, type in the product code in the box.
5. Click next, from your library you can see all games registered to your Steam account. Choose which game you want to install, then click on the install button. When your done, the installation button will change to PLAY!
Related topic How to create account on Steam.
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