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Many years ago this company was bought out by OrCAD which in turn was bought out by Cadence.
I suspect that Cadence will not give you the time of day unless you buy the latest version.
What sort of problems are you having? Try the book by Paul Tuininga on PSPICE. It is probably available at used book web sites like bookfinder.com and was written many years ago when Microsim issued the program.