You are downloading the Mediummy AppXBundle file v2016.1119.1023.0 for Windows Phone. Mediummy is a free and useful Books & Reference app: Mediummy is a Medium.com reader/client app for Windows powered by (Cortana) and (Cloud Syncing) to (sync) your current page & favorites between ... You can now download the offline AppXBundle file to install & try it.
Download Locations for Mediummy 2016.1119.1023.0 AppXBundle file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline AppXBundle 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 Mediummy AppXBundle file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.