The installer for the app can be found attached to the bottom of this article. Once installed you'll be able to run the TerraSync2TerraFlex app from Start -> Trimble -> TerraSync2TerraFlex.
This application was developed to help users who are transitioning from TerraSync to TerraFlex by enabling them to convert their existing TerraSync Data Dictionary Files into a set of TerraFlex templates.