Maybe send me an email at onionman@onlyhuman-studios.net ?
Then I can send you a private APK and we can make sure it's not a corruption when I updated the file on itch.io or such.
Edit: I asked on the discord about this error and SideQuest bot was able to give me this
"
Hey there @Onionman! It looks like you are having issues installing an APK. This can be caused by a drop in your internet or by a USB connection problem. Try another USB ( not the cable that comes with your quest - it doesn't work ) or try to download the APK file directly using the download link on the app listing and then drag and drop to the top left of the 
SideQuest window to install. Thank you!"