Zoom has announced that their latest update is required (presumably because it contains significant security updates). You will not be able to login in unless your Zoom client is updated to a version great than 5.0 by May 30.
The easiest way to assure that you can sign in to a meeting or to worship now is simply to go to your zoom app, click on your profile picture in the upper right corner (it may simply be your initials or the name of your computer). About 3/4 of the way down the menu that opens is an option, “check for updates.” It will determine what version you have and download and install an appropriate update for you.
Et viola!