The ZorinOS Upgrader tool should allow you to upgrade from Core to Pro. But the Upgrader tool for Z18 is not released just yet, so that may not be possible right away for Z18 Core to Pro, but should not be very long to wait.
Here is devs response to Upgrading Z16 Core to Pro when the Upgrader tool was being finalised. Will Direct upgrade be ready for Zorin OS 17? - #21 by AZorin
1 Like