I have just installed Windows 10 Preview, Build 10074, on a Surface 3 Pro. I then installed an EyeX device and Tobii.EyeX_1.5.0.75.
The driver installs properly and I see Tobii EyeX Controller in the device manager. The setup starts and I get stuck at ‘Find a comfortable position where your eyes can be detected.” The LEDs illuminate as expected, but my eyes are not detected.