Ordinarily Zoom keeps itself up to date automatically. You can also ask it to update manually by opening the Zoom app on your laptop, clicking the zoom.us menu at the top of your screen and selecting Check for Updates....
However, if you encounter an error when updating the Zoom app on your Teacher laptop, you may need to follow the instructions below.
Manually Update the Zoom App
Click the Magnifying Glass icon in the top-right corner of your screen, type "Self Service" in the search field, then press Return to open the KSD Self Service app.
In the app, click the Browse item on the left, then find the Update Zoom item and click the Install button.
This should install the latest (or at least a recent) version of Zoom onto your laptop.