Deactivate Premium

When I first started using MP Premium I had nearly 1,300 newsletter subscribers. Now that MP is eliminating subscribers who are inactive the subscriber base has gone below 1,000 and it no longer makes sense to use Premium. So I’ve switched back to the free plan I originally used.

Now that I’ve done that can I eliminate the MP 3 Premium plugin on my site and retain the Free version of the plugin? Anything I should do before deactivating the Premium plugin?

Also, does MP have any provision for displaying a recruitment pop up encouraging readers to subscribe?

The page I need help with: [log in to see the link]