When I try to order the upgrade from C5 to C6 with my shipping address set to Canada, everything works, it lets me choose payment, but it gives me this bizarre message: http://i55.tinypic.com/2hfj4gi.jpg
If my shipping address is set to the USA, it processes the order correctly and doesn’t give me that message. What does ordering a C5 -> C6 upgrade have to do with being a student and needing to supply proof of academic studies? Or maybe more to the point, what does having my shipping address be in Canada have to do with being a student and needing to supply proof of academic studies?
I just changed my order to ship to the USA and problem solved. Strange issue, though.