AudioBooktoMP3.com has released AudioBook Converter for Mac 4.2.4. It’s an upgrade of software designed to convert all kinds of audiobook such as .AA, .AAX, .M4A, .M4B to unprotected MP3 and AAC formats.

The app can batch convert DRM-protected or unprotected audiobooks to MP3 files with 16X speed and CD quality. AudioBook Converter for Mac 4.2.4 costs $34.95 and can be downloaded from the developer’s website (www.audiobooktomp3.com). All registered users of  AudioBook Converter for Mac can upgrade to the latest version for free.