You are downloading the Contacts+Message Backup XAP file v18.104.22.168 for Windows Phone. Contacts+Message Backup is a free and useful Productivity app: Note: To use this app, please go to Settings on your Windows Phone. This app will NOT appear in your list of installed apps. Contacts + ... You can now download the offline XAP file to install & try it.
Download Locations for Contacts+Message Backup 22.214.171.124 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 Contacts+Message Backup XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.