You are downloading the Markdownr AppXBundle file v2016.1023.2313.3296 for Windows Phone. Markdownr is a free and useful Productivity app: A full-featured markdown viewer for Windows and Windows Phone.Built for speed.* Fast display and scrolling even on the smallest Windows ... You can now download the offline AppXBundle file to install & try it.
Download Locations for Markdownr 2016.1023.2313.3296 AppXBundle file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Markdownr AppXBundle file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.