Dang, you have a nice machine! I just ordered a new computer myself. You've also been with Linux longer then most. It used to be viewed as a hackers OS for the longest of time.
Linux has gotten better over the years to find itself in the desktop environment, and to general computer users.
I'm sorry to tell you this, but the upgrade feature will not be coming to Zorin OS16's release until months later.
https://forum.zorin.com/t/the-road-to-zorin-16/3456/147?u=startreker