I haven't used my scanner for years and just made usb connection to my imac turned on scanner and doesn't show. It's not on my devices list. I earlier contacted Canon to download a patch and it said there was no patch for Catalina 0S. To try to use without a patch. Need to connect my scanner to get work done.
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If the scanner is no longer support by a Canon driver you could look into using VueScan by Hamrick Software.
I am able to use a Minolta scanner that was last supported with Windows XP on my Windows 10 computer using VueScan.