Hi @brock, sorry to hear about your troubles and thank you for letting us know about these specific issues. The latest release 4.0.5 of the Unity SDK has fixed the readme but we are aware of some visual bugs when using it in unity 2019-2020.
This can be downloaded @ https://developer.tobii.com/pc-gaming/unity-sdk/getting-started/
I have spoken to the developer responsible for Unity development and he has asked that you kindly reach out to him directly on Discord @ alex8b#9170
and he will try to assist in resolving the remaining problems.
Thanks for your patience and best wishes.