I have a CanoScan 8800F and until I upgraded to 10.8 the other day, I was a happy user of MP Navigator EX 1.0. I have now downloaded and installed MP Navigator EX 4.0 from the link above and also the corresponding update to the scanner driver (Ver. 13.9.2a).
No luck. Shortly after launching, MP Navigator EX puts up an error window with a list of supported products that does not include my CanoScan 8800F - despite the fact that I had re-installed the software after installing the updated driver. Restarting didn't help either.