Hi, I used to have this prog. I don't ever remember it needing a dongle but I do recall when I installed it to my HD I had the same problem.
I remember that I ran SNOOPDOS and discovered that the installation had missed out a file. I can't remember which file it was (it was a long time ago) but I do recall that after discovering the missing file with snoopdos, I just copied it of the disk onto the HD and it worked fine.
If you've got snoopdos try running it before you start Caligari and you might discover it was the same problem I had.
Sorry I can't be of much more help...
Cheers

Franko