You can install updates to your apps, plug-ins and Muse Sounds content directly from within the Hub. These will appear as update notifications.
Clicking the notifications tab should reveal a list of update notifications, along with a summary of release notes. You can choose to update them by clicking the orange "update" icon.
You may also notice that the buttons around the app have changed to "update" - clicking any of these will trigger the update process.
Finally, you can also see updates in your Library.
Updates to Muse Hub itself will also appear here, although unlike other product updates, they will also be automatically installed when the application restarts.