Your device should be relatively new (XP serial number.)
On our site, after you type in your serial number, in RED TEXT the following instructions tell you exactly what you need to do:
SCT will no longer be providing the firmware files as a downloadable link from our website. In order to update to this firmware and any future firmware, please download and install the latest SCT SF3 Power Flash Ford Programmer Device Update Software below. Within this program, select to Automatically Check for Updates while connected to the internet and your device will be updated automatically. The tune revision update will take approximately 5 minutes for completion.
Download that device update software that is listed there, install and it will install the drivers you need. Once finished, plug in your device through usb then select to automatically check for updates. Let that finish then you can choose the load custom tune button to load the custom tune file to your device. After that you are done and can flash your vehicle with that file.