Hi BigWaveSteve. Welcome to SitePoint.
I haven't used NoteTab (I'm a Mac user) but the download process looks fairly simple as far as I can see. If you go to the Downloads page, you have the option of clicking the big red Download | Lite button, or you can click the link a little further down that says "NoteTab Light (full)ZIP: 1.8 MB".
Have you tried either of those options?
There are many other free code editors out there that may be better anyway. A few I know of for Windows that are very well liked are: