Hi there, I’m not sure what you mean by delivery plugin. Cart66 has stopped producing the free version of the plugin and moved to a subscription model. But you can download the original free copy here –
https://www.dropbox.com/s/6yfvg9ig956u3mn/cart66-lite.zip?dl=0

The next release of the theme will be remodelled to use WooCommerce in place of Cart66. The dev team are currently working on this.

Unfortunately, we’re unable to assist with refund requests directly, as the item is sold via Envato. You will need to request a refund via your Envato account for this item if you wish to proceed.