You are downloading the Band Store AppX file v188.8.131.52 for Windows Phone. Band Store is a free and useful Productivity app: A comprehensive list of windows phone apps connected with Microsoft band.Updated with latest Microsoft Band applications in Windows Phone ... You can now download the offline AppX file to install & try it.
Download Locations for Band Store 184.108.40.206 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 Band Store AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.