For any Mac users stuck here, you have to install python first. You can find that online or follow this link:
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Then just open up the application and create a file by copying and pasting the code provided. Save the file as "dfd.py" From here, just move the file into the same folder as the Start.bat file. Once you've done that, just double-click the dfd.py file, and your python application should automatically run. At the top of the screen, you'll see a "Run" option. Click that and go to Run Module. It'll open the game up in your browser. Make sure to have a save file from Ch. 4 or 5.