Beginning on April 28, 2016 the Fitbit app for Windows 8 and Windows 8.1 will no longer be available for download. Customers who already have the app can continue to use it, but the app doesn't support our new trackers such as Fitbit Alta, Blaze, Charge 2, and Flex 2.
We recommend using our redesigned and enhanced Fitbit app for Windows 10 after upgrading your PC, tablet, or mobile device to Windows 10. For more information, see about About the Fitbit app for Windows 10
. In the meantime, you can use fitbit.com to see your stats on a Windows 7, 8, or 8.1. PC. See How do I set up my tracker?