yesir360 said:
I'm just not sure what it says if the language is different...

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That is interesting... I wonder if you're able to downgrade from something like 21H1 to 2004 this way. Most downgrade tutorials seem to suggest changing a value in registry, though I'm not sure if this would actually work.

Just attempted a 1909 iso and it does let you, but when it asks to choose what files to keep you only get the option of "remove everything". The other two are greyed out. I suppose during incorrect language it'll be the same as well

What underlying problems are there with the operating system or performance?
Did you want to use an older Windows version and maintain files?
Drivers can be backed up and restored.
Do you need to keep applications or can they be reinstalled?