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2025-10 Cumulative Update for Windows 11, version 25H2 for x64-based Systems (KB5066835) (26200.6899) keeps on failing for me

Markens Desir 275 Reputation points
2025-10-14T20:26:53.6066667+00:00

This update keeps on failing for me and I've tried to download it from the Microsoft catalog and im still getting errors, the error codes im getting is "Download error - 0x80240069" from the windows update & im getting a error from the standalone installer saying 0x800700c1.

Also does this cause nvidia to not function properly because im aslo getting a 7zip CRC data error when trying to download the latest graphic driver

Windows for home | Windows 11 | Windows update

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  1. Sylvain F 16 Reputation points
    2025-10-17T10:30:13.5933333+00:00

    DISM /Online /Cleanup-Image /StartComponentCleanup

    then reboot enabled me to go on with the update automatically after reboot

    1 person found this answer helpful.
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  2. apppro 155 Reputation points
    2025-10-18T13:58:21.73+00:00

    OK - at least Grok helps... supposedly Microsoft knows there is an issue with the Update and they have NO real solution: Sure would be better if they made this more easy to find:

    https://free.blessedness.top/en-us/windows/release-health/status-windows-11-25h2

    grok answer

    https://free.blessedness.top/en-us/windows/release-health/status-windows-11-25h2

    1 person found this answer helpful.
  3. Ro Bra 5 Reputation points
    2025-10-18T22:04:15.4566667+00:00

    I had the same problem with the same KB but the error code was 0x800f0983.

    To solve the problem I use windows update in option to reinstall repair version:
    windows update >> advanced options >> Repair >> Fix problems using windows update.

    Then, I clicked on button "Reinstall now" and the windows update reserched a repair versin based in my windows installed.

    The download and reinstallation process took a long time but in addition to reinstalling Windows 25h2, it also installed KB5066835 (26200.6899).

    1 person found this answer helpful.
  4. Travis Murch 5 Reputation points
    2025-10-21T00:36:46.9033333+00:00

    @Nicholas Page recommended the correct general approach - check the CBS log file. Skip all of the general approaches as they often take time, patience, and do little or nothing to help resolve the issue. It is all in the details :-)

    As soon as your update fails, open the file C:\Windows\Logs\CBS\CBS.log in Notepad/Notepad++

    Starting at the bottom of the file (scroll down or CTRL+END), open a search (CTRL+F) and select to search Up (Notepad) or Backward (Notepad++), searching for Error (I'd recommend , Error so it only flags the message type and not the content) as well as fail which may show up in the message content. Continue searching for log entries and it will inevitably lead you to the culprit. In the content of the message(s), you are looking for general types of errors (missing file/folder/package, access denied, etc) and file paths associated with them. You may need to string together multiple error entries to identify whats going on, but they should appear in close proximity.

    Unfortunately I did not preserve my CBS.log file prior to taking action (gets replaced on re-run), but ultimately its the same approach every time. In my case, I do recall there was a missing file required for proper installation of a package tied to the update, with a generic message like "missing package". The path indicated was under the main folder C:\Windows\SoftwareDistribution\Download, which is the target for update downloads and the source for update installs.

    There may be cleaner ways to do this, but I stopped Background Intelligent Transfer Service (BITS) and Windows Update services and then deleted the contents of C:\Windows\SoftwareDistribution\Download. After re-running the update, it went through without issue.

    This took me a total of 5 minutes to resolve, not including the update time, although YMMV. Skip the junk, read the logs.

    1 person found this answer helpful.
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  5. TommyTempest 5 Reputation points
    2025-10-23T12:18:52.0066667+00:00

    I'm pretty sure now that the error has nothing to do with individual PCs, unless they do not meet the criteria for the update.

    With that said, the issue was a bad distribution file and has been resolved. My 2 systems that were problematic, corrected themselves with a new forced update that came in overnight. The error message is gone and I now have the updated beta version 26200,6899 for Beta Channel for Windows Insiders on Windows 11, version 24H2.

    1 person found this answer helpful.

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