According to the information that you are able to find on the developers official website, MP3 Rocket - MP3 Downloads was released as a freeware version. Therefore, you don't need any registration key to use this application. Moreover, the download of an audio files is also freeware. You can download MP3 Rocket - MP3 Downloads through Software Informer application's page or you can visit its official website and download it directly from there.
