As of the 0.8.0 update, the SM127 legacy codebase is public and free to clone and use wherever you need!
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Download Godot 3.5.3 from here. While you could attempt to transition the project from Godot 3 to Godot 4, we do not recommend it.
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Download the repository as zip, or fork the repository then clone it using the git software of your choice.
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Through Godot, open the
project.godot
file found in the source code.From there, you are free to edit the project as you wish!