Help troubleshoot lock-up issue

[Forpli]

It seems it is not possible to upgrade from 16 pro to 17 core:

Cannot upgrade from 16.3 Pro to 17 without purchase new OS

Hello there, I want to upgrade my Zorin OS 16.3 Pro to 17. But any time I enter the support key, I have to purchase the OS 17. Thought upgrading from 16.3 Pro to 17 is free - or isn't it right ? Best regards Jens [Upgrade_OS_17]