Avision produces different software builds for different scanner models. You must find the page specific to your hardware.
is a utility designed to simplify the scanning process by allowing users to assign specific scan-to-destination tasks to the physical buttons on their Avision scanners. Quick Take: The "One-Touch" Workhorse Avision Button Manager V2 Download
This is the most common mistake. If you plug the USB cable in before installing, Windows will install a generic driver that conflicts with Button Manager V2. Avision Button Manager V2 Download