No legitimate copy of Poppy Playtime Chapter 4 exists yet. The only safe way to play is to wait for the official launch on Steam, the App Store, or the Google Play Store (for mobile versions). When that day comes, you won't need a shady "Geokar" installer—you'll just need a valid payment method and a stable internet connection.
Not yet announced. Developers typically reveal trailers months in advance. poppy playtime 4 geokar install