There are two possible locations where you can download the software (driver and CaptureOnTouch) for the R40: https://www.usa.canon.com/internet/portal/us/home/support/details/scanners/ document-scanner / imageformula-r40 -office- document-scanner ?tab=drivers_downloads Canon USA website:
The length of documents that can be scanned with the R40 scanner is normally 356 mm (14"), but you can scan documents up to 3,000 mm ((118") long by setting the scanner to the Long Document mode. Follow the steps below to enable Long Document Mode on the scanner.