You are downloading the Microsoft Build 2015 APPX file v22.214.171.124 for Windows Phone. Microsoft Build 2015 is a free and useful Business app: Download the Microsoft Build official mobile app. This essential event app allows you to manage your personal agenda, view session ... You can now download the offline APPX file to install & try it.
Download Locations for Microsoft Build 2015 126.96.36.199 APPX file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Microsoft Build 2015 APPX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.