What platform are you on? For windows just download 'Essentials v0.1' and launch the game.exe file.
The version is r43.1 :)
can the mobile version be modded?
I am working on getting it to work on Android, it will probably be available later this week. But right now, you could use JoiPlay I'm pretty sure it runs RPGMaker MV games, but I haven't tried it myself.