You are downloading the Flat Notes AppXBundle file v2015.1023.633.0 for Windows Phone. Flat Notes is a free and useful Productivity app: Flat Notes is a well designed notes app with a unique experience based on Google Keep! DISCLAIMER:1. It can't sync with Google Keep because ... You can now download the offline AppXBundle file to install & try it.
Download Locations for Flat Notes 2015.1023.633.0 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 Flat Notes AppXBundle file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.