Unfortunately we have just learned that the contact form on esotericsoftware.com has not been sending us the messages. If you have sent a message and not gotten a reply, please accept our apologies! We have fixed the problem and you can send a new message, or if you prefer you can email us: contact@esotericsoftware.com
As always, please use the forums for your questions if possible, which allows others to benefit from the answers.