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see here: https://community.ptc.com/t5/PTC-Mathcad-Installation/%D0%BF%D1%80%D0%BE%D0%B1%D0%BD%D0%B0%D1%8F-%D0%BB%D0%B8%D1%86%D0%B5%D0%BD%D0%B7%D0%B8%D1%8F/m-p/795404#M1779