Virtue Premium is not updating

I have several sites using the Virtue Premium theme (love Virtue).
I am having this “update” problem only on one of my sites: https://strong-start.org

My problem is that I am not receiving the notice “Update Available”, thus my theme is stuck on 3.3.9 (versus 3.6.1).
Appearance –> Themes: shows no “Update Available” message
Dashboard –> Updates: (says my theme is up to date)

I am using the “one-click Child Theme” plugin (but I use that plugin on all my other Virtue sites with no issues).
No other themes are installed.
WordPress is up to date 4.5.1

Is there a way to force an update to Virtue Premium 3.6.1?