Gaussian 16 is the latest version in the Gaussian series—a powerhouse in the world of computational chemistry used by chemists, chemical engineers, and physicists worldwide. Because it is a proprietary, professional-grade software, finding a legitimate "free download" is a common but tricky search.
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No legal free download of Gaussian 16 exists. Pursuing illegal copies puts you at legal and cybersecurity risk. For most computational chemistry tasks, the free/open-source alternatives listed above are excellent choices and widely used in published research.
Because it’s proprietary, you cannot legally download Gaussian 16 from torrent sites, file-sharing forums, or “cracked” repositories. Doing so violates copyright law and your institution’s ethics policies.