1/ Open Finder (on Mac) or File Explorer (on Windows) and navigate to the preset folder for Tonal Balance Control 2.
    On a Mac, this will be located at Users/username/Documents/iZotope/Tonal Balance Control/Target Curves.
    On Windows, it will be usually located at C:\Users\username\Documents\iZotope\Tonal Balance Control\Target Curves.
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2/ Copy the downloaded .json presets file to the preset folder.
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3/ Launch iZotope Tonal Balance Control 2 in your DAW (Digital Audio Workstation) and open the target curves you want to use