You are downloading the Photostream XAP file v18.104.22.168 for Windows Phone. Photostream is a free and useful Photo & Video app: You can now use Cortana to tell Photostream to update your lockscreen wallpaper! Just say: "Photostream update my wallpaper"Photostream can ... You can now download the offline XAP file to install & try it.
Download Locations for Photostream 22.214.171.124 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Photostream XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.