Hi intelligen,
You are partly right. Right now it is not possible to download EyeX for Windows, since we are still working on some remaining features and stabilization of the software. However, when we are shipping the EyeX Dev Kit it will include a trial version of EyeX for Windows.
The limitations of the trial is still not decided, but will be communicated when we get closer to the release date. Also, EyeX for Windows will probably not be sold separately, but always be bundled with the eye tracking device.