You are downloading the Authenticator XAP file v220.127.116.11 for Windows Phone. Authenticator is a free and useful Productivity app: The Authenticator app generates security codes you can use to help keep your Microsoft account secure. You can add your Microsoft account to the app ... You can now download the offline XAP file to install & try it.
Download Locations for Authenticator 18.104.22.168 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Authenticator XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.