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unable to download update windows - 2025-09 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5065426) (26100.6584)
KB5065426 is an old update from last September, has your system not been updated in a while.
1
Click your Start Button, type winver and hit Enter
Please provide a screenshot of the resulting dialog.
2
Open the Settings App
Go to Windows Updates
Please provide a screenshot of that window
I have added the screen shots, My computer has been trying to upgrade but fails. I have turned off security and still fails to upgrade.
Sorry, I was offline, your version of Windows 11 is very much out of date, the best option would be to perform an in-place repair with the Windows 11 ISO.
Please ensure you download the ISO in the same language as you use for the Windows UI, follow the steps, this is then not like re-installing Windows, it is just like an update and your personal files, settings and installed software will not be affected.
Click this link:
https://www.microsoft.com/software-download/windows11
to download the Windows 11 ISO
When the ISO file completes downloading
Disconnect from the Internet
Disconnect all external devices with the exception of a mouse or keyboard.
Temporarily disable any 3rd party Anti-virus you may have installed
Then, in Windows File Explorer, double click the ISO and then run Setup.exe and select the Install option.
Very Important - ensure you select the option to keep your files and apps.
