If you are a big fan of Fitbit and like using their recently overhauled sync software for Windows 8.1, then you will want to grab today's update. It just went live a few minutes ago.
Although not much has changed in the app itself, there are "Improvements to Tracker syncing", which should help those of you who use the Fitbit USB dongle to sync with the Modern app.
Full story from the WindowsCentral blog...