You are downloading the Authenticator+ XAP file v184.108.40.206 for Windows Phone. Authenticator+ is a free and useful Productivity app: This is the only Google-compatible authenticator that works on Windows Phone because others do not synchronize time properly.This application ... You can now download the offline XAP file to install & try it.
Download Locations for Authenticator+ 220.127.116.11 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 Authenticator+ XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.