Much to my dismay Microsoft, who now owns Skype, will be ending what was known as Skype Classic (ver 7.40 or 7.41) as at the 1st September 2018 making users download the new version 8.25

You can read more about it here:

https://www.neowin.net/news/microsof...one-over-to-v8

Although it is being promoted as an upgrade there are many users who are very unhappy with the latest version. You can read some of their comments here:

https://www.macupdate.com/app/mac/15805/skype/reviews

Perhaps I just don't like change ... but I was quite happy with Skype classic.