What does "NOT REGISTERED" in
section on the website actually mean?
It can also mean that you haven't downloaded and installed the product(s) listed yet. If you do, it/they will appear under "Registered Products".
For example, I have Hypha listed there. It is also visible in my Native Access, but I just haven't installed it yet, so it's not considered as registered.
It means that you own given licence, but you have not inserted that licence number to Native Access. And so it does not show in NA to be installed.
Are these transferable? Can another account register these with the serial number?