You can install updates to your apps, plugins and MuseSounds 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 MuseHub itself will also appear here, on Windows they will auto update when the application restarts and on MAC it needs to be manually updated as of version 2.5