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I Bought student edition of prime and mathcad and only prime got downloaded from the disc. The link that came with the product key to download matchcad isn't working at coming up 404 error.
You can find a latest Mathcad 15 M045 service release here:
http://support.ptc.com/products/mathcad/mathcad-15-0/free-trial?refid=cadventure
http://download.ptc.com/products/mathcad/trial/mc15/Mathcad15_EN.zip