No. Only the host downloads it. Players join via web browser – no app or download required.
Jackbox Games rarely offers demos, but Party Pack 7 is sometimes included in “free weekend” events on Steam. jackbox party pack 7 download
This guide covers where to buy the game safely, how the unique "Phone-as-Controller" system works, and how to play online with friends. how the unique "Phone-as-Controller" system works