Remote Notification is very easy to upgrade. If you have the Automatic Update check enabled (it is enabled by default), Remote Notification will issue a health alert and inform you in the Home Server Console that an update is available.
Clicking the Download link will take you to the Remote Notification website where you can get the latest version. Uninstall the version of Remote Notification that is currently on your system, and then install the new version.
Remote Notification will automatically perform any update steps that need to occur and will retain all your settings and data.