Download and install python from here https://www.python.org/downloads/ (Tested on Python 3.7 and 3.8 on Windows 10 but newer version most likely will work as well)
Move the downloaded file to the twitch-clip-downloader-main folder and make sure the name is clips.json (might not be the case any more if you do this again)
Now that we have a list, let's do the actual download