It has been in the offing since November last year, but today Microsoft finally pulled the plug on Skype Classic.
Users of Skype 7.4 were met today with the notice above, which suggested that they either Upgrade to Skype 8 today, or otherwise Quit, with no other option available.
For the hundreds of millions of Windows 7 users, Skype 8 is inferior to Skype 7, lacking features such as Split View. This is available in Skype 8, but only for Windows 10 users.
For users who prefer the resist the advance of time, no option besides downgrading to Skype 22.214.171.124 is possible. This cannot be downloaded from Microsoft but can be found on a number of reputable archive sites.
The move is another hint that Windows 7 users will have a better experience upgrading to Windows 10 sooner rather than later, a move that will become a necessity after Microsoft withdraw support from the old OS in January 2020. Those users will likely soon face a very similar upgrade prompt.