Software is only half the battle. The FS4000US features both USB 1.1 and SCSI-2 interfaces.
SCSI Connection: This is much faster but requires a SCSI card (like an Adaptec 2940) and a desktop PC with legacy PCI slots. Most modern users stick to USB for convenience despite the speed penalty. Summary Checklist for Setup Check your cable: Ensure you have a standard USB-B cable. canoscan fs4000us software download
VueScan (Recommended)VueScan is the gold standard for legacy scanner support. It includes its own built-in drivers for the FS4000US, meaning you do not need to install the old Canon software at all. It supports the scanner's hardware-based infrared dust removal (FARE) and provides much better color depth than the original FilmGet software. Software is only half the battle