– Extract “X-ray (version).zip”
– Copy content of “X-Ray” folder to Maya UserApp Directory.
– you can check your “user App Directory” by typing “internalVar -userAppDir” in Maya’s Command Line.
– Drag and drop “InstallX-Ray.mel” to Maya’s Viewport
– press the gear icon beside the shelf
– hit load shelf
– load “shelf_XRay.mel”