When a "Commercial" extension is paid for, it's usually for support and bug fixes. These guys do not care about their products, customers or reputation.
I would NOT recommend purchasing anything they claim to provide.
Expect disappointment and a large amount of wasted time only to end up with a less then mediocre ticket system in the end.
Try something else, there are plenty of worthy (supported) products out there.
I recently resubscribed to get the latest version for a new site and was a bit disappointed with the way support was. However, with their new support options I've been very happy. David worked directly with me to resolve the few issues I had and everything seems to be good to go now.
I've recommended AEC to many people in the past and I'm happy still to give that recommendation.
However, if you are not savvy with AEC/Joomla, I'd highly recommend taking them up on their support options.