For a unit, I would recommend calling your Pulssedata office near you. Or, maybe this will work, now if you want software, new or old, just visit www.braillenote.com then click on the link that says brailleNote software downloads and it'll take you to a page with multiple upgrades. These are all the same, these are called version 4.01 build 1988. If this doesn't work, assuming you already know how to upgrade your software, try the link on that page call something like older software downloads. Click there and you should be at the right place.
Cody
