I downloaded Mathcad prime 5.0 via the link provided after purchase. When I doubleclick setup.exe (after unpacking), I got prompt "Do you want to allow changes to your disc?", I press "Yes" and the window closes and nothing happens.
I have Win 10 and MS framework installed.
Contact PTC support: https://support.ptc.com/support/mathcad_supportCenterOpt.htm.