@ocannady,
if you want the newest version of the RockOn, you should just be able to uninstall the current plex rock-on. And after doing a refresh (update button on the top right) see the updated version of the RockOn. Then you can reinstall it, and point to the same configuration and media shares as before. All that data should then be available for you again.
If you just want to update the Plex version within the RockOn you are already running, then stopping and starting the RockOn should do the trick (unless you specified a different version than “latest” during your initial install).
Hope, that helps