Important: Before starting the procedure, temporarily disable Windows Defender or any other antivirus to avoid blocks or injection errors.
Press the Win + X shortcut on your keyboard and select Terminal (Admin) or PowerShell (Admin).
Click the button below to copy the activation code. Then paste it into the open terminal window and press Enter.
The script will open Steam automatically. Click "Add a Game" in the bottom-left corner and select "Activate a Product on Steam".