Please confirm the information below first:
1.Please use iTunes version 12.6-12.9.
2.Please make sure iTunes is signed in, iTunes authorized the computer.
3.The Apple ID you used to sign in iTunes is not locked.
4.You can play the original iTunes audiobook on the computer.
5.Please re-install Leawo Prof. DRM if Leawo Audio Device is failed to install.
6.iTunes audiobook can not be converted on Mac OS X 10.15.
If above are confirmed, please restart Leawo and re-try to see if the same problem persists.
If yes, please contact us with the following information:
1.The iTunes version you are using.
2.The audiobook names you are converting.
3.Please click top Setting>Help in Leawo Prof. DRM to submit Bug Report.