Activating a Steam Key
From Outscape Wiki
Please follow these instructions to activate your Steam Key:
1. Launch the Steam client software and log into your Steam account.
2. Click the Games Menu from the top menu bar and choose "Activate a Product on Steam...".
3. Follow the onscreen instructions until you are prompted to enter your Product Code (the Steam Key).
4. Once activated, you will be able to launch Beyond Dark from the Library Menu tab.