Ah! For Android, you'll need to download our Launcher which pairs with the .rpa game file. We have a step by step guide here: https://zanithone.itch.io/a-house-in-the-rift/devlog/583030/android-installation...
Yep! Once you place the new .rpa in the "game" folder, you can delete the old .rpa file.
Hope this helps, if not lemme know and we'll get it sorted o/