Not sure if this was already explained in the deleted messaged, but if not:
What's installed from UU is the reverse engineered and ported code, it's not just a dummy app but it does still need the assets from a real copy of the game for legality reasons.
It's very easy to get Data.rsdk and the game is free on Android so it's easy to get a copy, you just need to do that yourself. The
Universal-DB page has where the files go and a link to a video on how to get it from the Android APK. Universal-Updater should've had a prompt message telling you you need the file after finishing installing, though it can be easy to miss that since it does allow you to quit the app without seeing it...