You are downloading the Authentication AppX file v126.96.36.199 for Windows Phone. Authentication is a free and useful Productivity app: NOTE: Before installing ESET Secure Authentication, please note that the product requires server side installation. This is a companion app and will ... You can now download the offline AppX file to install & try it.
Download Locations for Authentication 188.8.131.52 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 Authentication AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.