Try this:
Certain HP scanner/all-in-one drivers replace a file using an older version, you no longer have the ability to access the Canon TWAIN drivers from any application (information from Canon). If this is the case, would require a download of the “Mac OS X Data Source Manager”...
For Macintosh OSX users (including intel Macintosh computers) who have problems installing Canon scanner software, including older models. Please use the following steps to successfully install your scanner driver software:
Short Fix:
1. Use the "Deldrv" program to remove previously...