Hi stiffgroup,
Thanks for reaching out to us! I would be happy to help you 🙂
Indeed, if you use our plugin for one sub-site only, you don’t need to upgrade to a Multisite License. Can you confirm that you see a Disconnection notice in your account when you log in and go to My Account → License Keys? If that’s the case, you can ignore this message. We are working to improve this messaging and functionality. Additionally, you may not receive notification that updates are available. When an update is available, you will need to visit My Account → Downloads to manually update the plugin.
I hope this helps,
Cheers,
Jeremy