Dave Cleary, the source of the software passed away a few years ago. He was also the person that issued the registration keys. No one to my knowledge has picked that up.
Asking about the DOS version. The Windows version isn't on the copy of the DOS software (usually on a floppy). But the DOS version is on the CD with the windows version.
I guess my old XP laptop is worth a lot since it has a registered copy of the software on it. Lol