Because it is a proprietary system font, "free hot downloads" found on unofficial third-party sites can often be legally dubious or carry security risks. Here is how you can access it through official channels:
If you are looking for a similar clean, modern sans-serif aesthetic without the licensing restrictions, consider these free alternatives: apple sd gothic neo light font free hot download
Understanding the usage rights is critical before including this font in your work: Fonts included with macOS Sonoma - Apple Support (EG) Because it is a proprietary system font, "free