from my understanding, https://github.com/yuliskov/SmartTube/releases/download/late... links to 30.56, which the newest clean version. Old app stopped at 30.48.

I installed 30.56 from the git link on my Shield. It did not overwrite the old one, as it has the old signature. I manually uninstalled 30.48. I did not use the backup/restore option in either as I didnt want to dirty any data in the new app.