Did it give an output file?
If so, change the file extension from .epub to .zip
Expand (unzip) the zip file and see if you can read the files inside.
If you can, it suggests it's the problem may be in the final compression stages and pdurrant's epub-zip applescript may help.
If no file is created or you cannot read the data in the zip file, it suggests you haven't fully followed the decrypt procedures.
Check you have the correct python and pycrypto environment, then check again you have run the scripts using the appropriate parameters. Python does seem fussy about " ' marks, you may have to do a bit of reading in the forum to see what works in windows as you are doing it in windows.
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