I had DNS 15 running on a W7 laptop. I upgraded to W10 and didn't have to activate. But, then I started seeing how I could upgrade using that installation. First, I moved it to a more powerful laptop, I had to activate, then I moved it to a very fast desktop, and now I can't activate, number of activations exceeded.
I did some googling and found you could possibly uninstall, but I can't do that since I just moved the hard drive each time.
Can you ask Nuance to increase the activations for your serial? Any other suggestions?
PS, what drove this upgrade frenzy was I discovered a massive increase in accuracy by upgrading to a more powerful laptop. I think by CPU benchmark went up 30%, and DNS was so much better.