Hi! I'm sorry it took me a while again, been out sick with the summer flu for a couple days...
Anyways, I hate to say the problem still persists. It seems some updates are installed correctly but others aren't, and I can't quite pinpoint which ones... my best guess is KB4512488 as this one has - according to the update history - been installed twice, once on August 18, once today, but both times I got that same error message when restarting after the updates...