You are downloading the eSentral AppX file v220.127.116.11 for Windows Phone. eSentral is a free and useful Books & Reference app: eSentral Reader is an EPUB reader design to read eBooks in EPUB 2.0 and 3.0 standards made available from WWW.E-SENTRAL.COM. eSentral is the biggest ... You can now download the offline AppX file to install & try it.
Download Locations for eSentral 18.104.22.168 AppX file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline eSentral AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.