Manual installs are generally better than the plugins. With the Plex plugin, you are stuck with whatever version jail you are currently on and are at the mercy of the plugin maintainer to update the plugin ..
I switched from the plugin a bit ago because of that ..
But! .. the PMS_Updater.sh method is what I used to use to manually update the plugin and I still use it on my manual install.. might still work on plugin versions .. might not .. dono
Update Plex Media Server on your FreeNAS Server with out waiting for plugin updates. This works with Plex and Plex Pass versions! PMS_Updater script
www.crackedconsole.com