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I've a working internet connection but when I run the mathcad install manager, it shows network error. PTC Mathcad
You have to be a bit more specific.
e.g.
What (version of) Mathcad (or Prime) are you trying to install onto what version of which operating system?
Luc
Mathcad 15 on my windows 8.1 desktop.
It's your home or college PC?