To update Zoom on Windows or Mac, open the desktop app, click your profile picture in the top-right corner, and choose Check for Updates.
The steps are identical on both platforms once the app is open:
This is the move I recommend to everyone.
If the updater errors out or Zoom keeps crashing, a fresh install clears the problem.
The desktop app and phone app update separately, so don't forget your mobile client.
Read the complete breakdown, fixes and what happens next.