Friend of mine is interested in Avast 4 Pro, the paid version. Does Avast, the company, offer student discount for Avast 4 Pro license? If so what type fo proof is required?
As far I know, yes, there is discount for students…
You can ask for more into here: sales@avast.com. 
At the above link, educational institution is mentioned but not students. Anyways, I will drop an email to Sales.