Windows 10 Update August 11, 2026—KB5120249 ends with download failure 0x800f0805

Question

Windows 10 Update August 11, 2026—KB5120249 ends with download failure 0x800f0805

Thomas 0

Hello!

The update August 11, 2026—KB5120249 ends with download failure 0x800f0805.

I tried the MSU file from the Microsoft Update Catalog: No success. Message: "This update is not appicable to your computer." Event viewer for WUSA shows error 2149842967.

Edition Windows 10 Home 64 Bit x64

Version 22H2

OS Build 19045.7548

Thank your for help.

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1 answer

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Answer 1

David-M 123.5K Independent Advisor

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

To be able to assist you better, please clarify the following:

Do you have a third-party antivirus installed? If yes, which one?
Do you have any VPN software installed? (Even if it's not running at the moment) If yes, which one?

Looking forward to your reply.

Thomas 0 Reputation points

2026-08-20T04:51:29.28+00:00

No third-party antivirus software installed.

No VPN software installed.
David-M 123.5K Reputation points Independent Advisor

2026-08-20T12:06:21.7433333+00:00
Sorry for the delay in reply. I've been offline.

Thanks for the clarifications.

I suggest doing the following:

Run the Windows Update troubleshooter and try to install the update.

https://support.microsoft.com/en-us/windows/windows-update-troubleshooter-19bc41ca-ad72-ae67-af3c-89ce169755dd#WindowsVersion=Windows_10

If it persists, rename the software distribution folders as instructed below:

Open Start and type cmd, right-click on "Command Prompt", and select "Run as administrator".

Run the following commands at the Command Prompt one at a time:

net stop bits net stop wuauserv net stop cryptsvc ren %systemroot%\softwaredistribution softwaredistribution.bak ren %systemroot%\system32\catroot2 catroot2.bak net start bits net start wuauserv net start cryptsvc

After all these commands are completed, close the Command Prompt window, restart (not shutdown) your computer, and then try to update Windows.

If it persists, use the system file checker to repair possible corrupted or missing system files.

Open Start and type cmd, right-click on "Command Prompt", and select "Run as administrator".

Run the following commands at the Command Prompt one at a time:

dism.exe /online /cleanup-image /scanhealth dism.exe /online /cleanup-image /restorehealth dism.exe /online /cleanup-image /startcomponentcleanup sfc /scannow

Note: Pay close attention to the results of the commands. This will help you determine whether the procedure was completed successfully or if there was a problem. If you get any errors, let me know the error message that was displayed.

Then restart (not shutdown) your PC and see if you can update.

If the problem persists, please let me know, and I will provide another method.

Feel free to ask any questions you may have.