After loading Z3TA+ 2 as a soft-synth, I'm receiving a pop-up dialog saying, "Z3TA+ 2 is running in Demo Mode. Saving programs is disabled and periodic random silence will be produced." This version came with Cakewalk. I just double checked the old Cakewalk site and it's showing version 18.104.22.168, Released: 3/6/2017. I think the issue might be that I got a new computer and reinstalled everything fresh, so I suspect I'm missing a file from my old (which I still have). I thought this worked on my new computer.
I downloaded the install from the old Cakewalk site, reinstalled, but still the same issue. From the Z3TA+ 2 Options button there is an Offline Activation option. The option are, "Export Activation Request" or "Import Activation Response", which I never had to do this since it came installed with each version. I don't see anywhere to paste the serial number to activate.