
At the moment, disabling the “Windows Update” service seems to be the simplest way. I do not recommend to ignore updates, but with this setting you decide yourself when it’s the best time to upgrade your system.

So here is my Mediacenter checklist in case this happens again with future updates: …and the 1804 update is installed automatically on the server, you might notice your client mediacenters won’t work any more.

So if you use a Mediacenter combination like this, Windows 10 1803/1804 upgrade seems to include a dubious “feature” which disables custom firewall exceptions and deletes several registry keys, for whatever reason.
