Have you tried looking on the manufacturer's site... or phoning customer support. That's the best chance - Label Makers are rarely brought by the sort of people who put software in the Internet, so the software is unlikly to be anywhere but the manufacturer.
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.