Thanks.  My model's links are different, but the new software appears to work.

https://www.usa.canon.com/cusa/support/consumer/printers_multifunction/imageclass_series/imageclass_...

Also, to get the old toolbox uninstalled, I had to reboot into safe mode.  Otherwise the uninstaller just hung.  Then booted back into regular mode, removed all traces of the existing printer, then reinstalled the new software and it works great.