Sorry Bruce, we made a mistake by answering other’s question under yours. Regarding the issue you mentioned, please be well noted that in order to convert the DRM-ed Audible audiobook as well as iTunes’, it will require you install the iTunes app on your computer. Otherwise TunesKit won’t work properly since the conversion and DRM-removing process will require the iTunes to play the audiobook files in background. We also modified our official website by mentioning that. Thanks for your understanding. [@Bruce Fraser]