Sorry for that. We're changing how our updates work, and JLinked still uses the older method. If you upgrade JFBConnect to the latest v5.2.0 error, that problem shouldn't happen. The new installers for JFBConnect and JLinked both install the social profile plugins automatically, so we're removing the ability to auto-update them through the update manager. It helps ensure everything stays up to date together and should make support simpler.
I hope that helps explain, but if not, or you have other questions, just let me know.