I don't see any Apps button in my Zoom client.

Depending on the width of your Zoom window, apps may be located under the three dots (...) or More button.

If you still don't see apps under "More", confirm you're on the latest version of Zoom. More info here on how to do that. After you update, please fully quit the application and then open up Zoom again. You may also want to try restarting your computer. 

Let us know if these steps still don't solve the problem for you!