Hi @drdevil44, it seems like you are trying to include 3 differents Tobii SDK’s at the same Time; Tobii Core SDK, Tobii Interaction API & Tobii Stream Engine API.
These are not designed to work alongside each other and each have their own unique getting started guide which I can recommend you to follow.
If your project intention is simply Gaze Interaction on Windows, then we would recommend the Interaction Library @
https://developer.tobii.com/consumer-eye-trackers-interaction-library-getting-started/
These have the library files included, so you should not face any problems in compilation.
Please try out our c# sample program and let us know how you get on. Best Wishes.