Really sorry you didn't have a good experience. I'm not sure why you weren't able to get support. I've always done my best with that and I've recently formalized the process with a support center, ticketing system, and community based support.

If you're interested in trying the new version please open a ticket (http://duetapp.com/ticket) and I'll just give you a copy of 2.4, the current version. No fee. Just let me know what email you used when you made the original purchase.