Sorry for the confusion. Most add-ons from JFBConnect can't be updated from the installer. The Joomla Update Manager is just used to let you know that updates are available.
If you are out of date, please download the latest release from the My Account -> My Downloads area of this site. The newer v5.2+ installer is more streamlined and will clear up some Joomla Update Manager messages as well to make things more clear in the future.
I hope that helps, but if not or you have any other questions, just let me know.
Thanks,
Alex