You are downloading the Astra Militarum Builder AppXBundle file v2019.512.751.0 for Windows Phone. Astra Militarum Builder is a free and useful Books & Reference app: Build, edit and save your Astra Militarum armies to Ed 8 of the rules. Build your army by adding and editing squads, review your army then save it ... You can now download the offline AppXBundle file to install & try it.
Download Locations for Astra Militarum Builder 2019.512.751.0 AppXBundle file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Astra Militarum Builder AppXBundle file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.