[iBeth]

Thanks everyone! It's working now. I dragged and dropped to .adobe-digital-editions and when I ejected my kobo from my drive, this time it said "importing content" and then the books appeared. I feel certain I tried this yesterday and the books did not show up, but whatever, it worked this morning! I really appreciate all the suggestions.

ETA: I upgraded to Calibre 3.48 and installed the Kobo driver for 3.48, and my device is now recognized! Thank you to DNSB and theducks for pointing me to these versions.

(As to why I haven't updated Calibre, I recall it being an ordeal to keep my k4pc at 1.17 and to find/install a 3rd party Calibre plugin, and to figure out what my AdobeID is, etc. I am leery of having to go through all that again whenever I update Calibre. It has been long enough that I forget how I did it before, and it's working well enough. One of these days I'll need a new computer and I won't have any choice. The OS already refuses to update to Win11.)