On the beautiful island of Tropico, it never rains; El Presidente insists on it. So when the clouds roll in and the rain starts to fall you know something is on the way. Rumours are that a group of citizens have united to form a mysterious cult and have placed a curse over Tropico.
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