25 H2 Update Failure

AF_Vet 20 Reputation points
2025-10-17T13:05:14.3566667+00:00

Hi all. First time here.

I am currently on Win 11 24H2 and have tried to install the 25 H2 update. I keep getting an error message during the finish of the installation reboot saying, 'Something went wrong ...'.

After two tries on the update backout, I'm back to 24 H2. Win 11 is good for my current configuration

Does anyone have some suggestions that might help? I really don't know what to do next.

TIA

Windows for home | Windows 11 | Windows update
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Answer accepted by question author
DaveM121 939.6K Reputation points Independent Advisor
2025-10-17T13:40:13.6833333+00:00

The most successful method to install version 25H2 is to use the Windows 11 ISO.

You will need at least 40GB of free space on your C drive for the upgrade.

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.

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