MacOS Will Not Update

I don’t believe I have ever had this problem, but some people have over the past couple of years. When they go to update their macOS they get a message that the update is not available or the update cannot be installed on this computer. If this is you, and for future reference, this really excellent article lists several things you can do to get these updates to install. If you ever need to do this, or if you need to help friends or family, this is great information.