Cumulative update won't install (KB4571756) (Error 0x800f081f)

Anonymous
2020-09-11T07:31:06+00:00

I am running Windows 10 Home 2004 (Build 19041.450). Windows Update notified me that there was a cumulative update available to install (2020-09 Cumulative Update for Windows 10 Version 2004 for x64-based Systems (KB4571756)). When I told it to install the update, it will download and go up to "Installing - 100%" and then just show this error: 

I've tried the following in an attempt to fix the error:

  • Run "sfc /scannow" in an elevated command prompt
  • Run "DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:<Source of clean Windows 10 2004 ISO created using Windows Media Creation Tool> /LimitAccess" in an elevated command prompt
  • Uninstall and reinstall NET framework 3.5 from "Turn Windows features on or off" in Control Panel
  • Manually download the specific update from the Microsoft Update Catalog and install it
  • Stop the Windows Update service and delete the Windows Update cache located in "%SystemRoot%\SoftwareDistrubution", then restart the service

Obviously, none of these worked so I'm looking for any other solutions to this problem. Any help is appreciated.

Windows for home | Windows 10 | Windows update

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

0 comments

217 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Anonymous
    2020-10-06T06:30:25+00:00

    Your ISO may have been an older version but when you run setup.exe and say check for updates, it patches the ISO with the new updates. You may have installed the older version on your new build.

    Was this answer helpful?

    1 person found this answer helpful.
    0 comments
  2. Anonymous
    2020-10-05T16:26:51+00:00

    I have tried every trick I can find on the internet along with many others, to install this update. I just built brand new system, got all my programs on setup way I like it, but can't image due to this crappy patch that MS fails to test better or fix. So now, like many others we sit and wait and hope the fix isn't worse than the current update and break other stuff like past updates.

    Was this answer helpful?

    1 person found this answer helpful.
    0 comments
  3. Anonymous
    2020-10-03T05:51:01+00:00

    OHHKAY. LOOKS LIKE I LUCKED OUT. SECOND ATTEMPT AT IN PLACE UPGRADE HAS FIXED THE ISSUE AND I WAS ABLE TO UPDATE TO THE OCTOBER PATCH PREVIEW. I HAVE NO IDEA HOW BUT IT WORKED.

    Was this answer helpful?

    1 person found this answer helpful.
    0 comments
  4. Anonymous
    2020-10-02T22:15:34+00:00

    I had a patch a few minutes ago that required a Reboot.. So I did.

    Kept fingers crossed and after the reboot, NO GO.

    KB4571756 is a failure. Waiting for Nov patch then.

    Was this answer helpful?

    1 person found this answer helpful.
    0 comments
  5. Sumit 44,306 Reputation points Volunteer Moderator
    2020-10-02T01:26:20+00:00

    Was this answer helpful?

    1 person found this answer helpful.
    0 comments