1) To update Zoom please go to www.zoom.us/downloads
2) Next to the "Download" button is the latest version of Zoom.
3) Click on the "Download" button
4) Click on the install file and it will update your Zoom.
How to tell what version of Zoom you are in
Method 1
1a) Launch your Zoom App
2a) Below your "Sign In" button you should see the Version of Zoom you are on.
Method 2
1b) Go to the top right corner and click on your icon.
2b) Then click on the "Settings" Button.
3b) Then click on "Statistics" located on the left.