I'm on macOS High Sierra with no interest in updating further at this time.
In Skype, I regularly get notifications of updates being available, which I ignore unless I have a personal issue that would be resolved in the update. Too many times I've been burned by updating Skype only to have a new version be a disaster. I'm currently running version 18.104.22.168.
Today, I noticed a new message for the first time... rather than an update being available, I'm being told essentially that I must update:
Get the latest update to continue using Skype
It's like MSFT is trying to scare people into updating. Is my version of Skype going to stop working by April 2020?