Hardware: Nextbook Premium 8pse Downloaded Dropbox using Amazon and/or SlideMe Market. App loads and installs. However, as I open it I get message that a newer update is available. Do I want to download? If I say yes I get an error: X Application not installed An existing package by the same name with a conflicting signature is already installed. If I uninstall the app then I can't get the update unless I re-install the original download. Of coarse the same loop begins again. Any thoughts?