November 15, 2013 - JFBConnect v5.2.1 Released - Autotune fixes and other minor updates - Read the full changelog
November 8, 2013 - JFBConnect v5.2.0 released - Twitter Authentication and more.
You don't need to. You just need to install the main com_jlinked...zip file as if you were installing for the first time.
Doesn't hurt to uninstall first. Either way, all of your settings will be retained. It should be a pretty smooth upgrade process, but if you run into any issues, just let us know.