I just suggest uninstalling the sync then re-installing it. Unless there is an update. If it comes up with and update then I would Copy your FeralHeart folder just in case anything goes wrong because you may need to re-install FeralHeart. So then you may replace the new FeralHeart folder with the one you previously made a back up for. However, it there isn't an update option, just un install the Sync then re-install it.
Go to your Start button then go to "Control Panel"\Programs\Uninstall Programs then look for BitTorrent Sync and un install it :) Remember to make back up files of your FH folder~