Since development on Hypersonic 2 stopped years ago (succeeded by Steinberg’s HALion ), the source code was never updated to the x64 architecture.
They offer much better stability on Windows 10/11 and macOS. ⚠️ Important Safety & Compatibility Notes Hypersonic 2 64 Bit Dll
Despite the nostalgia, it is worth asking: Should you spend hours fighting with a hack when modern alternatives exist? Since development on Hypersonic 2 stopped years ago