we are sorry to hear that you are not happy with the plugin.
The functionality of your bubble site remains unchanged, all our plugin does is that allows users to add the bubble app to the Home Screen, configure a splash screen, app icon, installing meta tags and showing the latest loaded content when being offline.
There is no way of directly “downloading” the app. As of now, you will have to add the app to the homescreen manually. But that applies to all PWAs. The plugin does not ( and cannot) change the navigation and feel of your bubble app.