Hi @yxu79 and thanks for your query. The Tobii Pro VR and it’s Unity SDK is part of the Tobii Pro business department.
This forum is intended for support with the Tobii 4C (& EyeX) Eye Tracker and it’s own associated SDK’s.
Please get in touch with Tobii Pro Support department directly @ http://www.tobiipro.com/contact/contact-support/ for an answer to your query.
Apologies for the inconvenience and thanks for your understanding.