You are downloading the AstroTools AppX file v220.127.116.11 for Windows Phone. AstroTools is a free and useful 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 file to install & try it.
Download Locations for AstroTools 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 AstroTools AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.