I use threema like and am also for updates, bug fixes and improvements for the purpose. Unfortunately I did not get the latest updates on Amazon. Despite AmazonApp sync my installed apps. So in threema creates a backup and uninstalled. And once again bought in PlayStore and used the backup. :. (((Had everything need not be, but fortunately threema has corresponding functions :))
EDIT: The same problem I had with my launcher, so uninstall - install> Amazon re = new version. :)