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

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  1. Anonymous
    2020-10-06T08:32:41+00:00

    Oh okay that clears up a lot of things.

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  2. Anonymous
    2020-10-06T08:27:14+00:00

    So if I'm not wrong the ISO only gets the patch files added IF run from setup.exe?

    NO the updates are stored in the windows install folder on your hard disk and added during setup. Only way for files, like updates, drivers etc is to slip stream them into the ISO image. Running setup from iso only extracts window files to a temp folder for installing, if I read correctly what you are referring to.

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  3. Anonymous
    2020-10-06T08:25:52+00:00

    The ISO files are not changed each month to include the most recent Cumulative Update. Rather, we have the option to allow the ISO-based update to add the most recent CU during the upgrade or repair. By default it will add it in, unless you use the link from the first screen of Windows setup to disable any updates.

    Occasionally, the ISO offered does get a new CU added to it, but this seems to be pretty rare. Plus, even when this happens, a new CU will need to be installed within a month and each month thereafter.

    When Windows 10 version 20H2 becomes the public build, that ISO will have some CU included, but it may no longer be the most recent CU by the time the ISO is released to the public.

    I figured that would be the case as updating the iso's each month would be pointless, then we don't need windows update. I will just slip stream these updates, not a big deal and takes 20-30mins. Thanks again for your help and replies.

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  4. Anonymous
    2020-10-06T08:23:44+00:00

    "Use the ISO which was successful in resolving the update issue. That one most certainly has the September patch included in it."

    Well pretty much you can use any ISO because none have updated CU or other updates, that is all done when you run the setup. Only way to have an ISO with latest updates is slip streaming, which I will do for these 2 updates as it seems they are having trouble installing from windows update and I rather not fool with them on clients computers/setups.

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  5. Anonymous
    2020-10-06T08:09:00+00:00

    So if I'm not wrong the ISO only gets the patch files added IF run from setup.exe?

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