If you have more then one product template in your theme, then in some cases app may fail to add its code to all the templates automatically. In this case app will require custom installation. Please grant our support team access to your store admin, and we'll add the app code to your other Product templates also. You may send an invitation to support@nexusmedia-ua.com. Please don't forget to send us an email explaining your problem.
EasyTabs - FAQ