Where do I add my new Scrivener license key on the menu

I have been a licensed Scrivener user since 2016.
I just purchased the “old version” (that I have owned since 2016) so that I am already registered for the Windows 3 when it is finally released.

I remember that back in 2016, I entered my old license key in through the menu.

QUESTION: Where do I now enter my new license key??

The beta doesn’t use the license key stuff yet.