If you are a Plus member, you have access to various plugins while you have an active subscription. These are referred to as Plus plugins. Plus members only have access to Plus plugins while their subscription is active.
If you purchased a license outright for a plugin, this is referred to as a perpetual plugin. This means you bought the license and it's yours (like shopping at a store and taking it home with you).
Currently, ALL of our plugins are compatible with R23.