This video shows you how to check to see if you have the latest version of the Zoom app and how to update it if you don't.
Zoom requires that you maintain and update your version of the Zoom app. In other words, they do not allow you to run a version that is too old. If your version is too old and you do not update it, you will not be able to use the Zoom app. They do this to help ensure that Zoom users receive the latest Zoom features, as well as any privacy and security enhancements that they make to the platform.