You are downloading the Video calling in Tango XAP file v18.104.22.168 for Windows Phone. Video calling in Tango is a free and useful Education app: Tango is an entertaining, easy to use, free video calling service that connects people around the world with friends and family from wherever they ... You can now download the offline XAP file to install & try it.
Download Locations for Video calling in Tango 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 Video calling in Tango XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.