The software was never a free product, but the developers made it freee since they've stopped the development as well. On the official website, there are details on how to register and use the application. If you can't visit the page, I recommend checking the details below. You can use them to install the software, but support doesn't actually exist.
Benutzername / User Name: CueFireFree
eMail-Adresse / eMail address: email@example.com
Seriennummer / Serial Number: 0001.0100.0712.000.5
Aktivierungsschlüssel / Activation Key: 1229731
Official website: http://www.audiobytes.eu/