Hm do you have enough space? i think you need at least 5-6 GB.
Perhaps would this help, too? https://www.technobezz.com/fix-android-wont-download-apps/ or this: How to Fix Android App Not Installed Error? (mobikin.com)
Don't know but Ren'Py has an update. You can backup your saves: Release the 0.61 for Public | Xagrim's Gameforge on Patreon