SpecsUpdate
Supported platforms Mac OS X 10.9, 10.10, 10.11, 10.12, 10.13, and 10.14 Mojave beta
Supported Input FormatsDRM-ed Apple Music, M4P, Protected AAC (from iTunes Store), AAC, MP3, iTunes M4B, M4A music, AIFF, WAV, and Audible AA, AAX
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Cons
Con Does not work with newer Macs
NoteBurner only works on Mac OS X Sierra or lower. Their answer to not being able to make their software work on High Sierra and Mojave is for you to switch to a Windows computer.
Con Constant errors
Can only successfully convert about 1 out of 10 video files.