Hi,
As i am seeing, you purchased the ZoomEffect 2 years ago, on 14 October 2015.. So i would recommend you not to use it in the latest Virtuemart+Joomla Version. It won't support it.
You should get the latest version:
www.flexiblewebdesign.com/Virtuemart-Modules/Virtuemart-Zoom-Effect-Plugin
Since, your free updates subscription was expired long time ago, you have to re-purchase it (you can get the latest version by purchasing single-domain option, since you already have the multi-domain usage license you will keep using the ZoomEffect on multi-domains)
Regards.