This is not a true converter program. It’s a play-and-record program. It uses iTunes to play the Audible .AA audio file, and in the process, creates an mp3 version of it. You must install iTunes. There’s no getting out of it.
On December 20, 2013, SoS offered Aimersoft DRM Media Converter for free. It also required that iTunes play the Audible .AA audio file, which Aimersoft would convert only at the speed that iTunes could play it back. A conversion would take many many hours. Aimersoft’s latest version no longer supports Audible .AA audio files.
In comparison, TunesKit is able to do this a whole lot faster. The free trial converted 3 minutes of audio in less than 5 seconds. It also preserves the book cover (which Aimersoft never did) if played in a computer multimedia player. I plan on forking out the 10 bucks for the lifetime upgrade.