Large ad with latest updated, can’t dismiss

With the latest update to this plugin, we now have a very large ad for MailOptin at the top of every page of our admin dashboard. It has an x in the corner to get rid of it but that just leads to a 404. This is really offputting. If we disable the plugin, it goes away immediately, so it’s definitely the thing responsible. Please don’t abuse your users this way. Would appreciate an immediate update to remove this ad, or at least make it so dismissing it actually works. Our site is HTTPS btw.