Sorry for the delay in getting back to you. If you try the Joomla updater, it shouldn't cause any problems, it should just fail to update. Basically, the update package can't even be downloaded, so there's nothing for Joomla to install. Do you know what message(s) you received when you tried to do the auto-update?
As for your issue, can you explain what's going on? Are you getting an error message, and if so, what is it? Is it in the admin area, the front-end, when you try to log in, etc?
If you can access the admin area, you should be able to just install the JFBConnect package like it's a new installation and that should clear things up for you. If not, let us know what happens when you try.
Thanks,
Alex