You are downloading the Missing Phone XAP file v22.214.171.124 for Windows Phone. Missing Phone is a free and useful Productivity app: Don't worry about losing your phone again. Missing Phone allows you to create a picture with text overlayed on it that can be used as your wallpaper. ... You can now download the offline XAP file to install & try it.
Download Locations for Missing Phone 126.96.36.199 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Missing Phone XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.