The AI's gotten kind of upset. Somewhere along the way it decided you puny humans need more interesting ways to lose (or win, if you're one of those people, but who are we to judge). Vengeance of the Machine offers new tools to the player (like Core Turret Controllers) and a new frontal-confrontation victory condition (Showdown Devices),...
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
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