Zoom won't let me join meetings.

I am using Slackware 14.2 (64-bit) as my operating system, and when I first installed Zoom on it, I was able to join a weekly Bible study that the pastor of my Church hosts every week, unfortunately however, that was the only time that I was able to do so. How do I go about correcting that problem? Incidentally, when I was using Windows, I ended up having to download and install Zoom each time to get it to work properly.