As operating systems evolved from 32-bit to 64-bit architectures, legacy plugins utilizing DXi, RTAS, and older VSTi/AU wrappers became incompatible with modern DAWs. The original Kompakt player engine that powered Zero-G Nostalgia eventually ceased operation on modern versions of Windows and macOS.
For the best experience, it is always recommended to seek official legacy support or modern Kontakt-ready versions of these classic Zero-G libraries. As operating systems evolved from 32-bit to 64-bit