Most such files are either fake, virus-laden, or incomplete. Many forum threads (Reddit, GTAForums) explicitly warn against them.
Here are some popular download links for GTA San Andreas SFX and stream files: Gta San Andreas Sfx And Stream Files Download Rar WORK
Right-click on the new Streams folder > . Check the box that says Read-only is unchecked . Then click "Apply" → "Apply to all subfolders and files". Windows sometimes locks downloaded files, causing "Stream Read Error". Most such files are either fake, virus-laden, or incomplete