There were problems downloading some updates, but we'll try again later. If you keep seeing this, try searching the web or contacting support for help. This error code might help: (0x800f0805)

Eugene Co 0 Reputation points
2026-09-10T07:57:43.5+00:00

KB5122878 Failed to install on ‎9/‎10/‎2026 - 0x800f0805

Windows for home | Windows 10 | Windows update
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  1. SD - IA 178.7K Reputation points Independent Advisor
    2026-09-10T08:36:09.4166667+00:00

    Hi,

    I will walk through a few steps with you. Some of these are just to help figure out what is wrong, not to fix it right away. So if nothing changes after a step, that is normal. I will keep going until we solve it.

    Download the offline package from https://catalog.s.download.windowsupdate.com/d/msdownload/update/software/secu/2026/09/windows10.0-kb5122878-x64_191c536a44656eb754daa7cb7e9b517b05d690f7.msu and try installing it. Let me know if it installs.

    I look forward to hearing from you to get the results of the troubleshooting.

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  2. Eugene Co 0 Reputation points
    2026-09-10T10:55:06.3+00:00

    The update is not applicable to my computer.

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  3. Eugene Co 0 Reputation points
    2026-09-10T10:56:10.8433333+00:00

    The update is not applicable to my computer.

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    1 person found this answer helpful.
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  4. SD - IA 178.7K Reputation points Independent Advisor
    2026-09-10T15:02:04.76+00:00

    Hello,

    That means it is either installed or you are not running 64 bit machine.

    Please supply the following Information.

    Right-click the Start button and Choose the Run option

    Type in msinfo32

    Press enter.

    Take a screenshot of the System Summary window and post it in the next reply.

    I look forward to your response and am eager to collaborate until we find a solution.

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