Your mobile device is running an older operating system, pre iOS 9 and pre Android 4.4
You want to download an audiobook to an MP3 player
Effective September 4, 2019, Overdrive for Mac will no longer be available for download and Mac users will no longer see the option to download audiobook titles. Mac users can enjoy streaming audiobooks using Overdrive Listen through the Washington Anytime Library website.
eBooks and eAudiobooks for English Language Learners
RapidReads – Library card holders can stream or download eBooks using Washington Anytime Library. Rapid Reads is a series written between a 2.0 and 6.0 reading level. The plots are contemporary and entertaining, with adult language and themes.