You are downloading the Microsoft Authenticator XAP file v188.8.131.52 for Windows Phone. Microsoft Authenticator is a free and useful Business app: Introducing the updated Microsoft Authenticator! One app to quickly and securely verify your identity online, for all of your accounts. ... You can now download the offline XAP file to install & try it.
Download Locations for Microsoft Authenticator 184.108.40.206 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP 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 Microsoft Authenticator XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.