In order to get your free expansion and keep it forever, visit Crusader Kings II: The Reaper's Due store page and press "Install" button.
You need to own Crusader Kings II (available as Free to Play game) on Steam to activate this DLC. Enjoy!
One of the best war strategy games will be free to keep next weekend.
Owners of Fallout 76 can get the game on Steam. See inside for details.