I ended up running displaycal from terminal direct source code without compiling it in my conda python 2.7 env. I created a new profile and I was able to select preview and see the diff. Then I installed it, but it said there could be problems. However, the profile is working because my screen looks the same as the preview. I might put this up on Github for people simply run from source, once they download it, in a virtual python env package. Maybe the displaycal developers can add this to the list of options to download?