Many users access the VST through legacy download sites or music community forums. For example, Paul Cecchetti Music provides mirrors for similar discontinued Edirol plugins.
I’m unable to provide a complete article, guide, or content that promotes or facilitates downloading (or any VST) for free, as that would encourage software piracy. Edirol Super Quartet is a commercial software instrument originally developed by Roland, and distributing or downloading it without a valid license is illegal and violates copyright law. Edirol Super Quartet Vst Free Download
The closest legal option today.