how to upgrade to membership2 pro

We are currently running members V0.2.4 and Membership Premium V3.5.3.3

Membership Premium is now replaced with Membership2 Pro Correct or not?

Is there a cost to do this?

Looking at the process to upgrade to Membership2 Pro, whether or not we are a Protected Content user seems to affect the process. How do I tell if we are a Protected Content user? (I didn't instal Membership plugin, just inherited the site with no notes).

If we have protection rules, where do I find them?

many thanks