I tried installing the modified arcore-preview. First it asks "Do you want to re-install this application?" and when I go ahead, it says "App not installed. The package conflicts with an existing package with the same name."

Now, the app that the original arcore-preview.apk installed was also called "Tango Core" but for some reason I can't find anything called that or "arcore" or "AR" or anything to uninstall. Nothing shows up in Settings.

How can I do this? Is it impossible to remove the previously installed service?