You are downloading the AstroTools AppX file v188.8.131.52 for Windows Phone. AstroTools is a free Education App: This astronomy application will calculate the current position of the sun, moon, and planets. Click on an object to see the details like rise, set, ... You can now download the offline AppX package file to install & try it.
Download Locations for AstroTools 184.108.40.206 AppX file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline AstroTools AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.