Yes, you’re right. The link I sent is about a slightly different concern, it’s about how to get a non-networked computer working with Premium. My bad.
As mentioned, in the future, we’ll implement a purchase system that would enable you to purchase a license without ever entering a password to our server, but right now we can’t do that since the payment is/must be tied to an account.
Still, as a work-around you could use the method mentioned in the link, and simply use a unique password not used anywhere else for the online part of the operation.