Dear Geek Goddess, :-)
My initial thought about the manual download on your "painfully slow desktp computer" was: couldn't you have used one of your other household computers to download 21H2 (to CD/DVD/USB Stick), and thus bypass the space issue? However, reading on, you have obviously freed up valuable space by removing the 'junk' from the softwaredownload folder.
Portland MT,
I haven't dived into the Registry yet, but the About information shows 21H2 as the version.
My fingers are crossed that my PC will no longer prompt to update to Windoze 11. If it does, my next and final course of action will be to do a full factory reset. As my live files are on a network drive, I would only need to reinstall the layered products, to get the machine fully up and running.
Has MS finally buckled under the weight of comments about version 11, by releasing 21H2 for 10? Just curious.