Hi @shahan, I am afraid that the EyeX SDK has been deprecated in 2017 and is no longer available for public download. This SDK has now been replaced by both the Tobii Core SDK and Interaction Library API which you can freely obtain @ https://developer.tobii.com/consumer-eye-trackers/ and should hopefully cover all your interaction needs for application developments.
Apologies for any inconvenience and thanks for your understanding.