This is a poweful upselling tool.
When the customer visits his/her shopping cart page, this extension adds the message "Only $x (+VAT) more to Free Shipping!" above their products, thus luring them to buy more in order to benefit from free shipping.
Because this is a vQmod, no core files are touched, and the changes should carry over to the next version.
Please read documentation!
Support is at http://forum.opencart.com/viewtopic.php?f=23&t=84947
I hope you enjoy this extension. If you'd like to donate, please PayPal to email@example.com
A good companion module could be uksb's Spend x for free shipping http://www.opencart.com/index.php?route=extension/extension/info&extension_id=4056 which adds a similar message to the shipping area in checkout process.