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Hi @sashintha and thanks for your query. In order to be able to run the Tobii Pro SDK Python Bindings successfully with the Tobii 4C Tracker, you will need to purchase a special analytical use licence that comes with an unlock file to access the API.
You can read more about this and request a quote @ https://analyticaluse.tobii.com/
If however, you are flexible with respect to the language binding, you can freely use the Tobii Interaction library which can be downloaded @ https://developer.tobii.com/consumer-eye-trackers-interaction-library/
Should you be interested in 3D Graphics applications, we also offer Unity bindings @ https://developer.tobii.com/tobii-unity-sdk/
Please do let us know if we can provide any further information. Best Wishes.