I uninstalled all skype programs using Revo Uninstaller. I reinstalled skype version 7.40.0.104. I assume that is the classic desktop version that I needed. After installation, it took me to the same upgrade screen without allowing me to bypass this screen to allow me to log into skype. So, I clicked on upgrade to see if it would allow me to log in. A pop-up message appeared that said download of the skype update failed. Then, it said click here to go online and download the update manually. It too me to a webpage (which is below). The webpage could not be accessed.

https://ui.skype.com/ui/0/7.40.0.104...oad?setlang=en