Unable to update to current version on Android.
says package is invalid
I'm sorry you're having issues. Please check this post and read the section about android:
Serenity Chapter 2 (Episode 3) Release - Public! - Serenity Chapter 2 by N2TheFire (itch.io)
I do not know a lot about android. I only build it because renpy has an option to do so and this build was successful. I can also tell you that several other of my android users had no issues.