I am trying to purchase the product and have them install it, but the shopping cart on the website doesn't work. That is very interesting, a company that provides products for shopping carts has a shopping cart that doesn't work.
We are very sorry you were not able to use the checkout functionality on this site. We will be trying to reproduce the error with a view to fixing it over the next few days. This is the first time we've run into such a problem.
I believe an email has been sent to you with details of how to pay directly via Paypal for guaranteed 24-installation if you are still interested in using our product.
Otherwise, apologies once again for any inconvenience you have suffered as a result of this incident.