While the software is no longer sold, it remains proprietary. Roland retains the copyright. Downloading the software from unauthorized sources (often termed "warez" sites) is a violation of intellectual property rights. While enforcement regarding individual downloads of 20-year-old software is rare, it creates a legal grey area distinct from open-source software or legitimate freeware.
The legacy of HyperCanvas lives on, not in illegal cracks, but in the sounds that modern VSTs have democratized for everyone. edirol hyper canvas vst plugin free top download
This is the biggest hurdle for modern producers. While the software is no longer sold, it remains proprietary