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Here's the link for the modding tools, given for free by KK Game Studio:
https://drive.google.com/uc?id=1d6Cg5eIZNon97a9pyd0t9sxi6E0dwNkz&export=download

There are also a few tutorials on modding on their Youtube channel:
https://www.youtube.com/channel/UCqfW8lJwS3CLz0sWY_0RE3Q