Hello,
In this case, please ensure that you enable the "Root Permission" of LDPlayer9, and then you need to restart the LDPlayer9 to validate the settings. Please try again by following the user guide:
https://www.epubor.com/kindle-converter-user-guide.html
If there is the same problem, please feel free to contact us.
Best regards,
Epubor Team
Hello, thanks for your comment.
The trial version allows you to decrypt 3 books for free. If you want to convert more books, please purchase the license of this software.
Any other questions or concerns, please feel free to contact us via support@epubor.com.
Best regards,
Epubor Team

I have installed LDPLayer 9, the Kindle 4.16 apk and have successfully downloaded Kindle books. I found them in the LDPlayer storage at: emulated,0,Android,data,com.amazon.kindle,Files
Kindle Converter isn't displaying the books in the left hand pain. I've tried uninstalling and reinstalling all 3 items LDPlayer, Kindle 4.16 and Kindle Converter but it still isn't picking up the books. Any suggestions - Kindle Converter doesn't indicate where it is looking for books.