It turns out that the older version of Audible Manager has the ability to convert to cda (using Roxio software); but no one on the internet mention that. All was said is that one needs to downgrade to version 3.5 and 4.0 and work with another software (like GoldWave).
And the upgrade to
Nero 7 also has that feature. This will be my New Year project.
Thanks for all the suggestion. I learn something that would be useful going forward.