Found an old iso with W10 21H2 and wondered can I update it easily?

I'm trying to help a friend who can't install Windows Update 21H2. The update runs to 96% and then fails with a vague "windows can't update right now, we'll try again later" message. So far we've run Chkdsk /f (no errors found) and SFC / SCANNOW...

Has anyone else run this update and ended up with numerous duplicate files and folders as I have though it all works?

I was trying to change my slide show of pictures as background theme. Now when I right click on the desktop , then click on personalize , I get a pop up that is different from what I had before. Now the theme selections are no longer displayed for...

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