Greetings,
I understand you're frustrated. I'm sorry for the difficult to your experiencing. Let's make sure we understand the facts. OS updates are not forced. You didn't have to upgrade to Tahoe. It's elective.
It sounds like you had been using the scanner connected via USB successfully under a previous version of MAC OS? Was that Sequoia by chance? If your Mac is based on Apple silicon there's a good chance the Sequoia drivers will work under Tahoe.
That aside. Since you worked directly with Apple, what happened when you connected the scanner to your MAC? Does it detect the device? I'm not asking if it worked, just if it was detected at all?
Are you running any third party antivirus like crowdstrike? Etc.
I may have other suggestions based on your replies.
You also have the option of contacting Canon Support. To do so you will register the device in your MyCanon account, then call the number I'll provide below. Although thd R40 support portal only shows compatibility up to Mac OS Sequoia, there's a chance it can also work with Tahoe if your hardware is based on Apple silicon.
Start here, register the device first.
https://myprofile.americas.canon.com/us/
Then call support:
1-800-652-2666
Probably not of interest to you right now, but Canon makes it really cool capture on touch plug-in for scan to legal cases. Unfortunately it's only for windows currently.
https://www.usa.canon.com/shop/p/captureontouch-scan-to-legal-case-plugin-for-windows
R40 support portal
https://www.usa.canon.com/support/p/imageformula-r40-office-document-scanner#idReference%3Dsoftware-...
Hope this helps.
~Rick
Bay Area - CA
~R5 C (1.1.2.1), ~R50v (1.1.1) ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, ~RF 200-800 +RF 1.4x TC, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve Studio ~ImageClass MF644Cdw/MF656Cdw ~Pixel 10 ~CarePaks Are Worth It
