Pilz does not offer PSS WIN-PRO as a public free download. It is a licensed industrial safety programming software for Pilz PSS 4000 / PSS 3000 / PSS 2000 systems.
Not possible – it’s proprietary. You’d need to request the original programmer to export a PDF/logic description. pilz pss win-pro download
I understand you're looking for a download, but I must give you a solid, responsible answer rather than a direct link. Pilz does not offer PSS WIN-PRO as a public free download