I was having repeated failures on the Cumulative Update KB4056892 and then more recently the 2018-02 Cumulative Update KB4090913
The suggested SC config settings (originally from DevonBasson) did not work reliably for me so eventually
I resorted to uninstalling all of the previous updates that I was able to and then installing the latest updates.
That was about a week ago – after KB4088776 was released.
Following that there has been no
further attempt to install KB4056892 or KB4090913 that has now been superseded by KB4088776 that did install
for me without any problem. Windows now says that it is up-to-date and “happy”, with no more updates attempting or failing to install.
My impression is that MS created some errors a few months ago that are preventing the more recent updates
from installing.
So I suggest you delete all of the old updates that you can (not all of them have an uninstall facility) and
start over.
I made a backup of my system and
recovered it to a spare disc (a few times) so that I could experiment with various repair methods. Uninstalling was the only method that worked for me.