Technical Support for Jaksta Media Recorder

I have Jaksta Media Recorder 2 for Mac. 

This morning it would not launch properly: it was "hanging", with the spinning wheel. 

I decided to trash it and reinstall it. 

I then tried to activate it using the key I was given, but I was unable to do so. Tried several times and I now have the message "There has been too many attempts using this activation key" 

Please advise.

Thank you !