You will see a notification at the status bar when a new update is available. It downloads the update in the background and requests you to Install and Restart.
Once you click on Install and Restart, wait for the app to launch again by itself.
On Windows, do not click the app icon while the app is updating. The app will relaunch successfully after updating itself. Have patience and wait. If you do, and the app doesn’t install properly, you will have to do a clean install again.