Cannot get latest versions?! - 18.5.0.125

I have just downloaded and installed NIS2011 install from:

 

http://www.norton.com/nis11

 

It installed version: 18.1.0.37

 

When i click check for latest versions or update it tells me I have the latest version however on the sticky at the top of this thread it says NIS11 is up to  18.5.x

 

What am i missing?