Not sure if you already found a resolution or not...but try it from here...it worked for me choose the download with the applicable specs:
http://www.catalog.update.microsoft.com/Search.aspx?q=KB4093112
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Please help: 2018-04 Cumulative Update for Windows 10 Version 1709 for x64-based Systems (KB4093112) - Error 0x800f081f
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Not sure if you already found a resolution or not...but try it from here...it worked for me choose the download with the applicable specs:
http://www.catalog.update.microsoft.com/Search.aspx?q=KB4093112
WAITING SOUNDS GOOD
I have mentioned this before, but I was told by a Microsoft "level 2" tech that sometime this month, MS is supposed to come out with an update which is supposed to correct all of these "update issues" so I decided in mid-April to wait and see if this fix comes to pass. That is better and way less frustrating than trying different things or waiting endlessly on hold for a chance to speak to a technician. My computer is still working fine, even though I have had trouble like most of you "fighting" these update issues. I think right now that I have about 12 updates which have either "failed to install" or are "waiting on a restart'" which doesn't work either. And that included the Adobe Flash update and a number of KB...blah, blah, blah...updates. Keeping my fingers crossed.
Sounds good to me. There isn't anything wrong with mine except WU.
I have mentioned this before, but I was told by a Microsoft "level 2" tech that sometime this month, MS is supposed to come out with an update which is supposed to correct all of these "update issues" so I decided in mid-April to wait and see if this fix comes to pass. That is better and way less frustrating than trying different things or waiting endlessly on hold for a chance to speak to a technician. My computer is still working fine, even though I have had trouble like most of you "fighting" these update issues. I think right now that I have about 12 updates which have either "failed to install" or are "waiting on a restart'" which doesn't work either. And that included the Adobe Flash update and a number of KB...blah, blah, blah...updates. Keeping my fingers crossed.