Visual Studio 2012 - Updates

Hello Community, 

I have Visual Studio 2012 installed. From this link we can see all the updates released for VS2012.http://support.microsoft.com/kb/2707250

I am actually already updated to VS2012 Update 1 but I want to grab latest update. My question is:

1. Should I grab only update 4 from here. (http://go.microsoft.com/fwlink/?LinkId=327544) and everything from previous updates 1,2,3 shall be updated automatically OR I need to download those ISO (updates) separately?
2. How can I get latest most MSDN ISO for 2012 ?