If you have previously installed plugins and updates become available, you may see something similar to:
Updating Plugin in Astute Manager
In this example, there are both new installations and updates.
You can update plugins individually by clicking on each Update button.
Alternatively, you can either navigate to the Menu and select Update all plugins to update all plugins for the currently managed version of Adobe Illustrator.
Or, you can navigate to the Updates page by clicking on the menu entry in the left-hand menu and again, opt to update plugins individually:
Updating Plugins Menu Options
From here, it's possible to see what each update provides.
Please note that if you have more than one version of Illustrator installed, you'll need to update your plugins for each version.