Visiolist is a free script.
Your $30/year is not for the files, its for the support (when you ask questions or have an issue) and for the updates that are provided to the script itself. Plus the screenshot API requires an active membership to Visiolist.
You can continue to use the files once your trail runs out, but you won't have access to the new ones, or indeed the screenshot system (if you use it).
Hope that helps.