Looked through the pdf documentation and cannot find instructions how to perform an upgrade on an existing 4.0.3 Starter Kit to a new version like 4.3.3.

I've done this before from 4.0.2 -> 4.0.3 and there was instructions somewhere that made it very clear, but I am unable to find now to perform the 4.3.3 upgrade.

Any pointers?

Worked this out myself - shame because documentation seems to be lacking in areas like this.  Really makes a good project like DotNetNuke feel amateurish. 

Solution for people that couldnt find it elsewhere:

1. Download latest starter kit and install.
2. Backup your directory where your current starter kit runs from otherwise you'll loose your web.config and its a good thing todo before any upgrade (I suggust backing up the database too).
3. In VS 2005 - Create a new website, and choose DotNetNuke Web Application Framework, in the Location choose the existing directory of your current starter kit.  When asked say replace existing files.
4. Run the project and check all your third party modules are working.

Job done.