Darren is right. You're not going to get a disc for a free download. You might try the trial and see if you have better luck there.
Student's are not allowed physical media per the Education Community policy. Typically, the only occurrence that media is shipped out for free is to commercial users on an active subscription contract. Commercial users not on an active subscription contract can also request media, however there is a $ fee associated. Please not that in either case, only 3-4 versions back are generally supported / available.