Hi! It depends on what you're playing on. If you're on PC, just download the game, extract it from the archive, and you can play, but only with SteamVR. If you have a PICO or OCULUS headset, you need to download the APK, transfer it to your headset, and install it, or you can download and install it directly from the headset.
Also, there's a bug in the game where you can get stuck. I don't know why it happens, but to fix it, you need to raise your hands up, and you'll fall back to the ground. Right now, optimization isn't perfect, but I think I know how to fix it.
Your friend needs to restart the game if he's flying. As for the second thing, I don't understand. If you're talking about monsters appering in different places, that's related to synchonization.
