After you click "download Zoom client" the button will turn into a "use Web app". You don't even need to download anything if you cancel the system dialog askin

After you click "download Zoom client" the button will turn into a "use Web app". You don't even need to download anything if you cancel the system dialog asking you where to save the download. However I still find this UX pattern incredibly deceptive. People and companies seriously need to stop using Zoom