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No install for: 2025-09 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5065426) (26100.6584), error 0x800f081f

Limcher, Peter P 0 Reputation points
2025-10-09T16:56:45.2666667+00:00

Can not install update: 2025-09 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5065426) (26100.6584) (2). Getting "failed to install" error 0x800f081f. Please assist.

Windows for home | Windows 11 | Windows update
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  1. David-M 95,290 Reputation points Independent Advisor
    2025-10-09T17:32:39.37+00:00

    Hi. I'm David, and I'm happy to help you.

    The error 0x800f081f usually occurs due to a component store corruption.

    The best procedure to fix this is the In-place Upgrade. The In-place Upgrade reinstalls Windows, which helps to fix problems. It will also bring your Windows 11 to the latest version (25H2).

    But don't worry. It's a simple procedure, and you have the option to keep files, settings, and apps. Therefore, all your data is kept.

    (If you have a third-party antivirus installed, temporarily disable it during the entire procedure.)

    Download the ISO file to perform the procedure:

    1. Access the link below;

    https://www.microsoft.com/en-us/software-download/windows11

    1. Under "Download Windows 11 Disk Image (ISO)", click "Select download" and select " Windows 11 (multi-edition ISO for x64 devices)";
    2. Click "Confirm";
    3. Choose the language and click on "Confirm";
    4. Then, click "64-bit Download".
    5. Wait for the download to finish and proceed to the procedure below.

    After downloading the ISO, do the following:

    1. Double-click the ISO to run;

    (After running the ISO, you may need to double-click the "Setup" file to start the procedure.)

    1. On the "Install Windows 11" screen, uncheck "I want to help make the installation of Windows better" and select "Change how Windows Setup download updates";
    2. On the next screen, select "Not right now" and click "Next";
    3. Accept the terms of use;
    4. On the "Ready to install" screen, select "Choose what to keep" and select what you want to keep.

    (It is in this step that you must check "Keep personal files and apps" so that all your data is kept.)

    1. Click on "Install" and wait for the procedure to finish. Your computer may restart several times.

    At the end of the procedure, your Windows 11 will be in the latest version (25H2), and some updates may already be installed. But check Windows Update to be sure.

    If you get any errors or if the problem persists, please let me know.

    Feel free to ask back any questions.

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