Figured it out. So, if you tap the rpa file it will try and "update" the game (launcher) and then poof I guess. Which is what threw me off lol, couldn't find the rpa file, so had to wait a couple min to download new and move it to the game folder. Then it weirdly crashed, quickly followed with the app crash closing, so I couldn't even see the error message... but when I relaunched it, it worked. Just a bit of jank lmao
Tl;Dr is install launcher apk, then download rpa and move it to the designated file location (documents/ahitr_storage/game), and run it till it works XD