You are downloading the Audible eReader XAP file v22.214.171.124 for Windows Phone. Audible eReader is a free and useful Books & Reference app: AudiblePDFs is now called "Audible eReader" Audible eReader is a Text-to-Speech application that allows you to View and Listen ... You can now download the offline XAP file to install & try it.
Download Locations for Audible eReader 126.96.36.199 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP File To Install It Any More.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Audible eReader XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.