Kathie handles all of the upgrades for us here. You can order yours directly from her https://www.modmagic.com/item_6/System-Upgrade-2.95.htm or https://merchantmoms.com/service-price-list.php
There is a new version out that is pretty nice. The new one brings your site up to speed with Google, Bing, etc., and their wish that sites be responsive which means they work properly on all devices. It also has a zoom feature for images and product tagging for FB, etc., and product ratings.
You would need a new responsive template in order for this to work. You can either use one of our default ones (http://merchantmoms.com/templategallery.php) or get a new one pretty reasonably http://merchantmoms.com/templatedesigners.php