Julius,
Sorry for the confusion. Honestly, just ignore that message for now. The library has been updated due to some changes that were necessary for JFBConnect. However, those changes don't affect and aren't required for JLinked.
We're working to fix the problem by (likely) releasing a new version of JLinked over the next few weeks. There's no way to auto-update that library using the Joomla installer right now.
Sorry for the inconvenience and confusion,
Alex