Just bought Audio Recorder 3.0 Plus and the product key doesn't work.
For all the problems encountered with the Audio Recorder 3.0 Plus, a support ticket needs to be created through the contact page of the developers. They can say exactly what is the status of the serial number that you purchased or if the payment method was declined or suffered a chargeback, the developers might have blacklisted the key.
You can contact them using the following link: http://www.honestech.com/main/ContactUs.asp