Hi @ysato, It’s rather odd as I have the same setup as was able to get it working with little problem.
I wonder, can you build to 64bit a regular application (ie not using Tobii SDK?)
You could try uninstall NuGet Package, then change build conditions to 64bit, then install again “Tobii Interaction” package.
Out of curiosity, is there a chance you can try building on another system just to check?