First of all, we are sincerely sorry for this issue.
Please check what's the Audible converter version are you using now? Please ensure you are using the latest version.
Here is the download link:
For windows:https://www.epubor.com/audible-converter-download.htm#os_Win
For mac:
https://www.epubor.com/audible-converter-download.htm#os_Mac
They try to convert this file again.
If you are still failed, please send the failed file to my email address epubor.iris@gmail.com. I'll help you check this issue and fix it.
Any more problems, please feel free to contact us.
