Ates,
Re-install the JFBConnect v4.2.3 component. That should upgrade the library and SCLogin module to the latest releases. Those two extensions are shared between JFBConnect and JLinked, but the most recent changes to them are for JFBConnect only. So, if you installed JFBConnect and then JLinked, you'd actually revert those changes back to the versions included with JLinked.
It's confusing, and we're working on an improved installer to make things a bit simpler in the future. Sorry for the trouble, and let us know if you run into any issues with the above!
Thanks,
Alex