JFBConnect v4.3.0 Upgrade error

The main reason you likely can't install that is if there are permissions issues on your /libraries directory in Joomla. If you can fix those and re-install JFBConnect, that's probably the easiest option.

If not, you should be able to use the Joomla Update Manager to find the update and install it automatically from the admin area.

If that doesn't work, I'd recommend:
* Disabling the JFBCSystem plugin
* Uninstalling the SourceCoast Social Library from the "Manage" area of the Joomla installer
* Then, re-install JFBConnect again which should properly install it at that point.

Finally, if that doesn't work, you can find the original SourceCoast Social Library installer in the /admin/packages/ directory in the com_jfbconnect...zip file you're trying to install.

Hope something in there helps!
Alex