I believe the O.P. in that thread still needs his concerns and issue addressed - That users are getting the Wrong Release Version Download Link for Z16 Pro.
I think that this is a reasonable point of view. Some users opt to skip a "Pro" release in between major version releases. For example, they will choose Zorin OS 12 Ultimate (now Pro) and then use Zorin OS 15 Core. Then will choose Zorin OS 16 Pro, but will use Zorin OS 17 Core.
These are not required purchases, they are a Choice - one motivated by a desire to ensure that the Zorin Project keeps going. It is great to have such a choice, where you can use the same performance and support for free if you would like to (By using Core or Lite).

