Travel to the old train station and hotel, abandoned since 1947, following the 'disappearances'. Unravel the mystery that binds this place, by communicating with the ghosts of the long since dead, both in your time and theirs.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam