Yes sir... that probably is illegal, and is certainly against the vendors terms of transferring licenses. I do appreciate the offer, but bad karma from my perspective.
Ironically, I was going to buy Mach4, but wanted to get Mach3 back up and running as I hadn't used it in many years. Sadly, I also purchased a PMDX 411 in anticipation of this, but the absolutely atrocious customer service has me rethinking my intentions. I purchased a Mesa 7I76E last night, and intend to spin up a LinuxCNC controller. I experiment a lot with technology, so guess it's time for me to check out a new controller. It's really to bad, I did like the Mach3 product, but really hate funding a company with shitty service.
Anyhow I'll have some time to work on trying to recover the license file tomorrow, so maybe I'll get lucky.