Blow the horn, bang the drum, The Pig is coming to town! The Princess & The Pig DLC expands the base Stronghold Crusader 2 game with seven missions and two new AI opponents, for use in online Multiplayer and Skirmish mode. Do battle with The Pig, The Wolf and The Rat in Skirmish mode or try your luck against the noble Princess.
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