Updating Premium Extensions
The KB Support premium extensions are not stored within the WordPress plugin repository as they are not free to download, however updating premium extensions is done in the same way so long as you have a valid and active license for your extension(s).
Update Available Notifications
When an update to your extension becomes available, your WordPress dashboard will notify you in exactly the same way as it would for any plugin you downloaded and installed from the WordPress plugin repository.
If your license is no longer valid, you will still be notified that an update is available however, you will not be able to download and install the update.
Updating Extensions
Once you have received notification that an update is available, head over to either the Plugins page or the Dashboard -> Updates page from within your WordPress admin.