I suggest you follow the instructions given by
@softwaremaniac, as he is the resident Windows Update subject matter expert.
And, as you've already seen, in living color, what works on one machine may not work on another for any of thousands of possible reasons. But since someone who knows the Windows Update process, within a single version of Windows, or when upgrading from one version to another, inside and out has stepped in that's who you should be listening to and providing the data requested.