Windows UWP App from Visual Studio already installed, can't be uninstalled and won't run

Alright so I have an app called Currency Converter that I made in Visual Studio using UWP. When I try and run it from within Visual Studio I get a dialog box saying "The app "c347c8-blah blah" is already installed on this machine etc"

When I select no nothing happens. When I select yes I get the following error:

Error       DEP0900: Failed to unregister application "c347c8cc-961b-43a1-ae91-d83c61cffbf8_1.0.0.0_x86__eq9h3e6grdrp4". 
            [0x80073CFA] Unspecified error  CurrencyConverter   

I did notice that two versions of this app seem to be installed on my computer, link they are visible in the apps list in the start menu and in settings. Clicking these apps opens a window for a fraction of a second then it dissapears. Uninstalling them from here has no effect. When i try to uninstall from Apps & Features I get the error code 0x80073cfa.

I've tried cleaning, rebuilding and redeploying the project and the entire solution. This happens without error but the problem persists. I found this alleged solution to the problem link though it would seem that this would be detrimental. link

[Edit] I've tried running this app on other computers and it runs fine there.

The problem is that there is the same package name app was installed in the computer for other user, if you want to install the app, please try to uninstall the previous version or edit current app's package name to prevent conflicts.

Double click your app's Package.appxmanifes-> packaging tab->edit Package name.