Like I said above Calion, if you browse these NOW forums it's been ages since anyone has responded, much less with anything helpful. There are some alternatives to the product but you'll have to do the legwork and browse the posts, I can't give any specifics off the top of my head. I was never a NOW product user.
The fact that you even have it working with 10.6 is lucky. Again my suggestion is if you ever want to upgrade software and hardware you'll need to move to something else. The NOW forums were migrated here when the site closed. None of the regulars to the AppleCentral Forums
use it. The NOW forums were put here just as a reference.
Sorry about your plight but you need to find an alternative if you ever want to upgrade the OS.