"Downloadable audio" refers to audio content that can be obtained or saved from the internet onto a device, like a computer or smartphone, allowing you to listen to it offline whenever you want. Full definition
Modern audio books come in compact disc format or in downloadable audio file, usually in MP3 format. (hubpages.com)
Almost as long as there has been digital music, there have been podcasts — regular downloadable audio programs on everything from hip hop to high finance. (nbr.com)
If you're one of the first 10 people to buy the book this week and send in your proof of purchase, you will get a free downloadable audio version of the book! (rachelheldevans.com)