If your school does not offer a site license, NI has historically sold a "Student Suite." This is not free, but it is a one-time purchase that is significantly cheaper than the professional license (often under the price of a textbook). It usually includes Multisim and Ultiboard.
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If you have a .edu email address, you are eligible for the deeply discounted (or often free) student edition. Many universities participate in the program. Before you look elsewhere: If your school does not offer a site