You are downloading the Messenger (by ashterisk) XAP file v18.104.22.168 for Windows Phone. Messenger (by ashterisk) is a free and useful Social app: Now with update for Mango - 1. Toast notification of incoming messages (using background media player agent) 2. Fast app ... You can now download the offline XAP file to install & try it.
Download Locations for Messenger (by ashterisk) 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 Messenger (by ashterisk) XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.