Far as I know, you really don't have a course of action. Your purchase doesn't mean there is a contract for the guys to release regular updates to you. Your purchase is your purchase. They release updates to us because they can. There is no legal obligation on their part to put out more software for this product.

The worst thing that could happen is if emails such as yours were to send them over the edge and making them never return to this forum, and never release another update again.

As for refunds on an EOLed product ... I'm sure there's a deadline after your original purchase from which you can't get a refund ... better go to Ebay or the For Sale forum.

Greg