When I try to install the app it says "can't install this app on your device" do u know something I can do to fix that problem?
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If you have a older version installed you need to uninstall it and restart you phone.
you can backup your save from Phone\Android\data\com.upforkilling.gupp\files\saves
If your installing for the first time I have no Idea why its not working. I don't know how android works, I just use RenPys build in APK generator.