You should contact CK (or the reseller if thats who you went through).
I know the release of V21.5 is coming up, but I would think they would send out 21 now.
If your liscense is processed you can probably download it from their website as well.
I think the educational stuff is handled by TechEd now. this is a fairly new transition so perhaps you should contact them. Look at theis web page for contacts.
http://cadkey.com/resources/educorner/index.asp