Can't install APK's that have been installed before

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Mar 30, 2019, 4:35:06 PM via Website

I've build an app in Unity which has been working fine for months.

I then decided to reinstall the app because of an issue that later turned out to be a problem with a CSV file the app needed to access.

But after I had uninstalled the app and wanted to reinstall it I received the "App not installed Error".

I tried to install a previous version of the app and that installed just fine. I then uninstalled that because I wanted to try the newest version again. But now I'm not just unable to install the newest version but also the version before that. Every time I install and uninstall a different version I'm then unable to install that particular version again.

I've tried: - Rebooting the phone - Deleting the app's folder in the "Android->Data" folder - Just about everything I could find searching on Google for help

I'm on a Samsung Note 8 and I recently upgraded to Android Pie

Edit: I am unable to build a new version because I'm away from home for the next week.

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