n order to get the Canon CanoScan LiDE 20 working in OS X 10.5.8 (and from the comment responses 10.6 Snow Leopard as well)
Go to the
Canon CanoScan LiDE 20 product pageClick the “Drivers & Downloads” tab
Select “Mac OS X” from the dropdown menu
Download CanoScan Toolbox Ver. 4.1.3.0X (
Direct Download Link)
Download LiDE 20/LiDE 30 Scanner Driver Ver. 7.0.1.1aX (
Direct Download Link)
Install the CanoScan Toolbox first
When installing the driver specify the “Plug-Ins” folder in the CanoScan Toolbox installation directory
Open up the “CanoScan Toolbox, click settings and it should detect ScanGear CS 7.0X as the driver and scanning should work without a hitch
The scanner is fully operational including the scanner buttons to scan, copy and email (the button actions can also be customized)