Just Cause 3 DLC: Sky Fortress Pack (Just Cause 3)

How do I start playing this DLC? Just Cause 3: Sky Fortress is the first expansion pack in the Air, Land and Sea series. Conquer the skies with Rico's new Bavarian wingsuit, equipped with a variety of weapons. Rescue the Medici from the terrible Sky Fortress and the army of deadly robotic drones. I entered the game did not understand where to look for this heavenly fortress? In Steam it is written that the DLC is installed.