Skype 2.5 is the earliest version that functions. Versions prior to 2.5 do not install (tested on Windows 7). If you wish to use the video-calling feature, OldVersion.com recommends using version 4.0+ of Skype. Support for Skype versions 7 and below is ending. Support for Skype versions 7 and below will end on November 1, 2018 on desktop devices and November 15, 2018 on mobile and tablet devices. What does end of.