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Hi,
Please check whether you are having supported machine to use Mathcad 15:
Mathcad 15 M045: http://support.ptc.com/WCMS/files/167271/en/mathcad_15_m045_platform_support.pdf
Mathcad 15 M050: https://www.ptc.com/support/-/media/support/refdocs/Mathcad/15,-d-,0/mathcad_15_m050_platform_support_173918.pdf?sc_lang=en
Regards,
Rahul