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I can use MinimalGazeDataStream for get fixations but when I try to install the EyeX.Framework in visual studion it says:

Could not install package ‘Tobii.EyeX.Framework 1.8.503’. You are trying to install this package into a project that targets ‘.NETFramework,Version=v3.5,Profile=Unity Full v3.5’, but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.

What can be the use? How can I change the framework?