I have a problem for some time. One of my Windows 10 64 bit1803 computer has a problem with the Apple Software Update system. Every time the software starts, the same updates appear to be listed. I select the items to update and the software reports the updates to be installed. However, when I run the update software again, the same updates are shown.
Apple support forums are not helpful. No one gives any advice besides the "boring" uninstall ALL the Apple software (iTunes, iCloud, Apple Software Update etc..,) restart the Windows 10 computer and re-install the Apple software. They say that this "guarantees" the Update software will be fixed. I tried many times and no change. It never fixes it.