Oh you are under Windows. Unfortunately, the development is pretty much concentrated on Linux and partially MacOS for now. And also in future, when we create proper install packages for all OSes, you would not need to tackle with Python at all.
For now, I suggest you to use the DisplayCAL 184.108.40.206 installer for Windows from this site.
Just to let you know what I mean: The measurement button is greyed out and apparently in the windows version it is possible to verify the current icc-profil/display response, even when it is not generated with DisplayCal
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