If you have downloaded your Audible titles on your Windows PC in format 4, Audible will notify you via email that they will no longer support format 4 downloading. Therefore, you are only allowed to download enhanced format audiobooks with purpose of improving your listening experience. However, if you prefer to listen to your Audible titles in format 4, you can download them all to your device before they make the switch on 6/30/2020. Besides, Audible are working on a new software called AudibleSync which will replace Audible Download manager to download your Audible books. But you are still able to continue using the Audible Manager software to download Audible books on your computer as long as you are downloading in Enhanced format. Bonus tip: if you want to take full control of your Audible files, you can follow this guide to back up your Audible books. Audible Will No Longer Support Format 4 | eBook Converter
If you have downloaded your Audible titles on your Windows PC in format 4, Audible will notify you via email that they will no longer support format 4 downloading. Therefore, you are only allowed to download enhanced format audiobooks with purpose of improving your listening experience. However, if you prefer to listen to your Audible titles in format 4, you can download them all to your device before they make the switch on 6/30/2020. Besides, Audible are working on a new software called AudibleSync which will replace Audible Download manager to download your Audible books. But you are still able to continue using the Audible Manager software to download Audible books on your computer as long as you are downloading in Enhanced format. Bonus tip: if you want to take full control of your Audible files, you can follow this guide to back up your Audible books. 