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Might be a little late here lol, but if you're trying to update from an old version and then getting the "app not installed" popup, the only solution I know of is to uninstall the old version first. It's not ideal but it's not too bad with the fast forward features. I believe it has to do with a combination of how Google Play and the RenPy engine both work, so there's not much the game devs can do about it