You are downloading the Durandal AppX file v126.96.36.199 for Windows Phone. Durandal is a free and useful Productivity app: Durandal is a fast and compact personal assistant service, powered in part by Microsoft Cognitive ... You can now download the offline AppX file to install & try it.
Download Locations for Durandal 188.8.131.52 AppX file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline AppX 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 Durandal AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.