Before proceeding any further, please first try re-installing the ColorChecker Camera Calibration software as this will fix many of the issues you may be having.
After I have installed the ColorChecker Camera Calibration software on my computer, I can’t find the Plug-in in Lightroom to create a profile.
I have installed the ColorChecker Passport software on my computer but when in Lightroom I select File > Export with Preset, I don’t see the ColorChecker Camera Calibration in the list of available options.