I need to revise my first reply. When I went to my new MacBook Pro, I simply transfered all my programs via the Macintosh system using a firewire cable. This did not install the driver for the MD device I suppose, and the MD device was not detected when I launched the Hi-MD music transfer program. I reinstalled the Hi-MD Music Transfer program and it works. Bottom line there is no need for any upgrades to use the latest version of the Hi-MD music transfer program to operate on Leopard.