You are downloading the PhotoBackup APPX file v188.8.131.52 for Windows Phone. PhotoBackup is a free and useful Utilities & Tools app: Photo Backup is an application that helps you backup your photos from some of popular social network sites like Facebook, Flickr, 500px, Instagram ... You can now download the offline APPX file to install & try it.
Download Locations for PhotoBackup 184.108.40.206 APPX file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline APPX 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 PhotoBackup APPX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.