You see old Jumpbacks on Ebay occasionally, so take a look there.
Also, you should directly contact Digital Juice, the files you need might have been packaged into something else that you can purchase. Heck they might be able to help you out with the old files, you never know.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.