Available directly from the S4A GitHub Repository .
You can also find links on the Official S4A Site , though the project is now officially discontinued in favor of newer tools like Snap4Arduino. s4a firmware free download
The (Scratch for Arduino) is a specialized code that allows your Arduino board to communicate in real-time with the Scratch programming environment. To use S4A, you must first flash this firmware onto your board using the standard Arduino IDE. S4A Firmware Free Download Links Available directly from the S4A GitHub Repository
The firmware is open-source and free to download from official and community repositories: s4a firmware free download