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Step 1: Download and install Steam application on your PC. The link to official download page can be found here.Step 2: Launch the Steam client. Login to your account if you already have one or register a new account.Step 3: On the bottom-left of the application you will find a button "ADD A GAME". Click there and subsequently select the second option - "Activate a product on Steam".Step 4: Press "next" to go ahead with the activation process.Step 5: Press "I agree" to confirm that you will abide the Steam Subscriber Agreement.