MacBook Pro doesn't see my CanoScan 8800F scanner

1. Catalina OS v. 10.15.7
2. Canon quote: "There is no driver for the OS Version you selected. The driver may be included in your OS or you may not need a driver."
3. Plugging the scanner directly to the computer, via a small Nonda brand USB-C to USB 3.0 adapter, did no good.
4. I restarted the computer and there was no change, except that the Dymo Labelmaker 450 that was on Finder before (recognized even after being disconnected) is no longer shown on Finder. Finder must've been seeing some factor of the installed Dymo software before, but isn't seeing it now. I'm sure it will when I reconnect the Dymo cord.
5. Because the two USB-C ports on one side are used for power and a wireless mouse, leaving only two ports, I use a Choetech multiport double pin adapter, then connect a Mokin multiport unit's wire into the Choetech's Thunderbolt port. The Dymo and scanner plug into the Mokin, and a WD external hard drive into one Choetech USB 3.0 port, leaving one USB port for temporary devices such as a camera. All my external devices are older, and have USB 2.0 cords. The adapters use 3.0 ports.

I keep trying to add a 300kb image of my connections, but this site crashes, and after 3 tries I'm weary of rewriting all the above.

Gary, I'm not ignoring your suggestion. I just haven't found time to explore it.

Thanks for the information. I do plan to check VueScan out. But Canon claims I don't need software with this Catalina version, and given I've had issues with this machine recognizing external disk drives, I'd like to make sure there isn't a glitch in the computer that needs attention first.

Okay, I got it (free version with watermark) downloaded and it works fine. I didn't have to follow all your steps, Gary; the scanner was already connected and on when I downloaded, installed, and launched VueScan. But in order to be rid of the watermark and use the slide scanner I have to go with the $100 "Pro" version. My Dad's hundreds of Kodak slides I'd planned on digitizing when I bought that scanner I guess I should've done long ago. They're the only ones I'd need to digitize. Once done, I wouldn't need the Pro version. I have other scanners but as far as I know the 8800F is the only one capable of doing the slides. It never has been fully functional in that things like the Email button on it has never meshed with any computer or mail program/server I've tried, so I couldn't scan directly to and immediately fire off an email. None of its onboard buttons ever really worked as intended, actually; I had to run it only by way of the computer and MP Navigator's various versions.

It's aggravating to us older buyers that devices aren't supported longer; from our perspective a few years is nothing. Even if the machine keeps grinding on, it's useless except with older computers that already have the original software program/drivers or can still accept the original software disk(s). It would seem that trying to force us into new equipment, by strangling the old, only ticks us off with that company. I used to swear by Canon products, but now just swear a different way. After 20+ years of their inkjet printers and multi-functions (40+ years of their cameras), last year in aggravation I went with a Brother MFC-L3770CDW Color Laser multifunction that may not do photos quite as well and has a larger footprint, but that costs a lot less to run overall, is significantly faster, does nearly perfect document copies, and rarely gives me grief.

Maybe its time to research Lide scanners and other brands capable of slide scanning, and just move on. That $100 Vuescan cash might better make a dent in a new machine. Still seems a waste. But that's the new world that's been built by cybercraft.

Thanks for your time trying to help! The watermarked VueScan version is relatively easy (maybe more-so than MP Navigator) and can be used for some projects with little issue. Other scans I still have one Canon multi-inkjet and the Brother I can use for. It's just that the 8800F has higher resolution capability when needed. And I have an XP, a Vista, and a W10 that have the 8800F MP Navigator onboard if needed. It's just that the Apple is faster overall and I was hoping to clear desk space of the older Windows units.