Audible has updated their official Windows app to v10.3.6. The update makes it easier to complete your collection of book series and to sort them in order.
The changelog reads:
Discover your book series
Now you can easily discover and sort your books in a series!
With Audible app, you can download over 200,000 professionally-narrated audiobooks and periodicals to your device. Find the updated app in the Windows Store.