Zorin OS does not have any "locked features" that are then "unlocked" by choosing Zorin Ultimate. Zorin Ultimate does contain a lot of additional software that are expertly meshed into the OS, saving a user from a lot of headache of trying to install them and allowing the user to explore apps they may have otherwise never considered before. Choosing Ultimate supports development as it helps cover Server Costs and funding.
I have wiped Win 7 or Win10 off all my computers here that I installed Zorin on.
Connecting to ethernet may be a method of temporarily gaining access to the net in order to download updates or software to help resolve missing wifi.
I am not sure as I do not have enough details available about your situation.
In this thread: Using Software & Updates to find WiFi Adapter drivers - #2
you asked about it directly. Let's try some more troubleshooting there and see what comes up.