My Canon LIDE 600F scanner is old but still worked very well. When I upgraded to OS 10.11 my computer no longer recognized the scanner. Canon has officially stated that they are not making new drivers for this product, but I had a similar issue with my tablet not working and was able to find a solution on this site. Does anyone know of a workaround?
VueScan might help. Honestly, you're better off buying a new AIO then trying to get these older machines working. You can also try deleting anything related to this Canon scanner that's on your Mac then checking if Preview will recognize it. I was reading here that some people had a limited amount of success doing that.