Back up your old freetrack folder and overwrite files from this package:
https://copy.com/hGzKyuRaOFGEQH2y
I don’t know how this files work together, but it’s work for me :). Tirview.dll is from TrackIR app and other dlls was taken from Opentrack app.
One thing that i do with this package was invert Y axis in Freetrack app.
RE- upload please