Windows 11, version 24H2 won't install

4. Is the safer way, true. The ISO method will give you the error code more easily so it has its uses to determine what the error code is and take it from there. It does require the language to match up thou and care needs to be taken. In the previous version you could loose your files... keep my files and apps. Probably what happened. The installation assistant knows which language it should use from the previous install. The logs are generated if it goes wrong so you can check the appropriate logs once it gets stuck in the first boot or second. It was the second where I had the most trouble. Only deleting the non compliant driver did it work. No hidden Microsoft hands came in.

Still no success. I've kept my programs and drivers updated manually and/or automatically, also using Norton Driver Updater and/or Intel Driver Assistant.

I passed the WindowsPCHealthCheckSetup.msi previously, on my first attempt to load 24H2. Based on comments that have been posted, I decided to try using Windows11InstallationAssistant.exe again (JariVolanen indicated it worked, but he moved from Win11 Pro 23H2 to 24H2. I have Win11 Home 21H2 and, of course, different hardware and software.) After fifty minutes, I got the prompt "Undoing Changes," like I have in my previous attempts.

After this failure, I decided to run WindowsPCHealthCheckSetup.msi again (today's download from Microsoft shows it was created 10/23/24). Now I get the prompt:

"You’ll need Windows 10, version 1803 or later to install this app."

Control Panel>System shows I have Windows 11 Home.

Considering all the posts that have repeatedly shown the update fails, perhaps Microsoft can come through with a fix one of these days.

I wouldn't hold your breath. Where the ISO run comes in to give the error codes to place you where you are. If it's got to 70% and unwinds it means it may have failed the memory integrity test if all other things are fine. Rather than pouring through log files this will quickly point you in the right direction... it did for me. If I'd used it 9 weeks ago, I wouldn't have waisted 9 weeks.

https://www.microsoft.com/en-us/download/details.aspx?id=105437

It's not published widely. They seem to go through their hand outs of advising do this, do that. Some threads have the individual solution where the tech person went through the users logs, other stop with no solution.

That tool above will pull out by name suspect drivers in the second boot which you can chase up as to what they are and whether they can be removed. I only had one and that one would have run for 9 weeks through the antics. I suspect Microsoft tech hands out aren't up to speed on 24h2 so don't cover how to identify the drivers of issue. You must get rid of all trace of non Microsoft anti virus programmes before any of this. Steady on updating drivers as well which can fail in the first boot. Once you get to the second boot and then a roll back you are nearly there.

I downloaded and ran hvciscan_amd64.exe. It identified seven drivers that "failed with compliance failure mask 00000202."
ssudcdf.sys

mbtusbser.sys

ctaud2k.sys

PxHlpa64.sys

rzpmgrk.sys

tifsfilt.sys

timntr.sys

I found details on each (description, company, version, date created, size, and multiple directories) for each and .inf files for five. I was able to delete an older version for ctaud2k.sys, but trying to delete any others said "File Access Denied: You require permission from SYSTEM to make changes to this file." I'm very reluctant to try removing the drivers or any .inf files since some are for Creative, Razer, and Acronis, all of which I use (I keep them all up-to-date). I don't recognize the names or companies for several, but that doesn't mean they aren't in use behind the scenes.

It seems strange, but after I deleted the older ctaud2k.sys, I tried rerunning hvciscan_amd64.exe (as an admin using PowerShell or Cmd) again and got the message "This app can't run on your PC. To find a version for your PC, check with the software publisher." After I rebooted, it worked and gave me the same results.

As suggested by Rodrigo.Queiroz, I also ran Disk Cleanup (Start menu, select Run as administrator) and deselected all options except "Device driver packages." It didn't seem to make any difference in the upgrade, but after rebooting, I haven't encountered any problems as a result.

I downloaded and ran hvciscan_amd64.exe. It identified seven drivers that "failed with compliance failure mask 00000202."

Please mention the error message/code you received when upgrading to 24H2.