The plugin does not work even on a completely clean system (the official Joomla! 3.3.6 Stable) + Joomshopping 4.8.1 with demo data.
I installed the plugin as it says in the instructions , checkboxes and general button "buy" appeared (http://joxi.ru/p27oXaaTLGpY27), but after selecting the item and pressing the button , a blank page - http://joxi.ru/MAjpxEEIdW7lme
Joomla: 3.3.6 Stable
JoomShopping: 4.8.1
PHP: 5.6.2
Website Url: local
JoomShopping: 4.8.1
PHP: 5.6.2
Website Url: local