
(You can also open it from the Applications folder, Launchpad, or Spotlight.) Click Continue and follow the onscreen instructions.


MacOS Sierra requires one of the following Mac models and versions of OS X. Download prior versions of Skype for Mac. If you need the previous version of Skype, check out the app's version history which includes all versions available to download. While the developer is fixing the problem, try using an older version.
SKYPE FOR OLD VERSION OF MAC HOW TO
Take a look at the information below to ensure that you meet all of the other necessary system requirements to upgrade to macOS Sierra, from our article: How to get macOS Sierra Sometimes, the latest version of an app may cause problems or not even work.

Your current version of macOS can be updated to macOS Sierra. If I'm understanding correctly, several apps are not working because you need to update your macOS.
