“It’s not free, but it’s not crazy expensive and it does all the work for you. You sign into your Audible account in the app, it will pull your library, download each book, decrypt it, and convert it to the format of your choice.”
Activation is straightforward and takes less than a minute. You can activate the license on up to (Mac, Windows, or Linux) with a single license. openaudible license code
Full software access and 1 year of free updates. The last version downloaded within that year works indefinitely. “It’s not free, but it’s not crazy expensive