Hey there. Sorry you're having problems. Are you updating from the free version TO the premium version? If so, on Android, I believe you have to uninstall the previous version and install the new version. You'd have to backup your save files to transfer them over.
Incomplete Package error sounds like maybe the download didn't finish properly? Maybe try redownloading the file.
If you're still having issues, I recommend jumping into the Discord to seek help. I can get to questions there much quicker, or somebody else may have the solution: https://discord.gg/VdNNXf8j

