Hi @bkasmai, glad to hear you managed to resolve the update issue.. hopefully shouldn’t trouble you further!
To subscribe to gaze data using the Interaction Library, we have produced a detailed tutorial in C++,C & C#:
Assuming you are most comfortable with C#, then you can view the tutorial @ https://tobii.github.io/interaction_library/sdk/html/sample_streams_cs.html
which demonstrates the correct syntax to use.
Something to bear in mind however for your project is that should you intend to be using the eye tracker for analysis or research purposes (which seems to be the case) then you will be obligated to purchase an analytical use licence from Tobii as our consumer level of eye trackers (4C, EyeX) are targeted for interaction purposes principally. You can read more about this @ https://analyticaluse.tobii.com/
I note however, you did not specify which eye tracker model you are using. This requirement is not necessary should you have a Tobii Pro Tracker.