Highly recommended because of the support.
As previous user mentioned in their reviews, I can confirm that the Checkout button is not working on Joomla 3.3.x
It has been also tested on IE 11, Firefox 32.01, and PaleMoon 24.7.2.
By clicking on the checkout button, nothing happens. I noticed Rockettheme about that, but it seems they do not care. Looks like it will be a graveyard component.
Unfortunately, we are not aware of any issues with our Checkout button on RokQuickCart.
Please contact us here and we will assist you: