Free upgrade?

Back in March I got an email from Norton saying I could upgrade my 360 for free to V4.0. I didn't get around to it but now that I want to do this- I'm not sure about how to do it. When I click on the link(s) in that email I get to: http://buy.norton.com/estore/mf/landingProductFeatures?sfid=DNdQMxDpmLCQlvcPLsHL1c0D1DJnfC9TqX1GmsKv8vT5RfLQDPLy!298206524!1278329822496

 

But there I see no clue about "free upgrade"- it's all about paying for a new program. Now, I suppose what will happen is that if I download it- the program will recognize that I already have an earlier version installed and the upgrade will go smoothly but I'm not 100% sure of this.

 

Joe