once you click on the above link, you will check " yes, i qualify for the education discount". you will submit proof at checkout.
I already received a box version I purchased but did not have to submit paperwork to make the purchase. The restrictions say I have to submit for approval before installing. I'm trying to figure out where and how I do that.
I think if you purchase at the official Adobe online store, they make you provide proof of student status before they let you go to checkout. If you buy a boxed version you pay in advance, which is a bit risky. Have you looked in the box for instructions on how to submit your paperwork? This will differ from country to country.