way using automaticupdaterBackend??

1. How to determine the "change in version" using the AutomaticUpdaterBackend ?

2. How to quickly check for updates using AutomaticUpdaterBackend ?

This is all covered in the Step-by-step walkthrough. If you have a specific question, then I'll be glad to help.

For most users we recommend either using wyUpdate as a standalone updater or the AutomaticUpdater. Not the AutomaticUpdaterBackend.