Just thought I should say – in case nobody else has and therefore you don’t know – that the link from the plugin details (i.e. that which you get when you click ‘Plugin Homepage’ from the ‘Details’ page generated from the WP dashboard) is giving a 404 error as follows:-
404 Not Found
Message: The specified key does not exist.
Sorry to put this here, but there’s no ‘contact’ method on your website!