You can find your Audiqueen licence key using the Administrator Tools.  this requires Administrator Rights.

Open Administrator Tools.

Click on Licences.
This opens a window with one or more licences.
Click on the licence you want to see and then on View Details.

Now you find the activation key...

If you don't have Administrator rights, you can retrieve the last 5 digits of the licence key in Audiqueen's About window.

Click on the Audiqueen crown top-left and then on About.

Click on the i next to the licence line to retrieve the last 5 digits of your licence key.