thanks, but I had tried all that bevor with no luck

meanwhile I managed to migrate 1607 to 1703 and all updates work

here's one of the errors I get:
x64 (KB3186568) – Fehler 0x800703f1

Having the same issues here ... virtually tried every suggestion I found from MS page. nothing helped. what can I do?

Fully resetting windows with installation from scratch is not an options as it...