If you're looking for a legal free option, Derivative (the developer) offers a that includes most features, with the main limitation being a maximum render resolution (typically 1280x1280 for textures and 720p for video output). You can download the latest official version from derivative.ca .

I notice you're asking about a free download for TouchDesigner Pro 2023.11600. TouchDesigner is a professional node-based visual programming environment, and the Pro version requires a paid license for commercial use.