Real 3D FlipBook PDF Viewer WordPress Plugin Update Via Email, None in WP Plugins

I have a license for Real 3D FlipBook PDF Viewer WordPress Plugin. According to my WordPress plugins tab, Real 3D FlipBook PDF Viewer is up to date. Why is it then, that I have received updates via email two or three times the past few months, notifying me of an update, yet WordPress shows no new update available? Is this plugin only able to be updated manually, by downloading through my account from the Envato web site?

Check this page, your answer lays out somewhere there:

Thank you.