Use your CD key on Steam.

Paranautical Activity

If you do not have a Steam account, you will need to download the client from the official website, install it and then create your account. Once you are logged into your account, click on "Add game" in the bottom left corner and then on "Activate product on Steam". After a few clicks on "Next", you can finally enter your CD key, the game will automatically be added to your library and the download will begin.

More information on Steam

Code for PS4 that needs to be activated on Playstation Network.

Activate your product for free through the seller or publisher.

CD key to use on the GOG GALAXY client to download your game.

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