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I used the code provided in http://apps.ptc.com/schools/references/install_creo3_unistudent_standard.pdf?_ga=1.44004205.99161915... and when i click accept i log in my account, and i get an error, i tried contacting tech support but i havent got a reply from them.
maybe installation assistant is not able to recognize network card in your PC.
Open Command prompt window and run following command
ipconfig /all > ip.txt
and publish the contents of ip.txt file. I can check information for you.