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PSpice was once available in many forms including SUN work stations and Macintosh versions. As the sales of these other versions declined they were not continued. I suspect that the effort to port it over to another platform will not be done until that platform takes over at least half of the operating system market to the exclusion of windows at engineering companies. This is not likely because these companies will still need windows systems to run programs that only us it.
On my former notebook I installed Linux and wine. Wine is a simulator for windows programms. I used pspice (MicroSim 8) and it works fine. BTW I only simulated circuits and did not make layouts. For layouting my designs I used a Eagle demo version.