My license from 1999 is still valid. I originally purchased it for doing slide scanning on an LS-2000 and once I stopped shooting film I did not use vuescan until a few years ago when I needed to do a bunch of flatbed scans. I was pleased (and rather surprised) that it still worked. I then purchased a standard edition license as a thank you for what to my mind was a remarkably principled commitment to his promise of a lifetime license.