Hi @mela501, the easiest way to proceed in this case is to start with a blank unity scene and then import the Tobii Library directly rather than going through our Demo scene.
We provide instructions for this (Step 5 onward) @ https://developer.tobii.com/pc-gaming/unity-sdk/getting-started/
and show explicitly the syntax @ https://developer.tobii.com/pc-gaming/unity-sdk/scripting-api/#tobiiapigetgazepoint
Please go through this and let us know how you get on. Best Wishes.