JayO,
You've probably already downloaded it all by now. But for the future (and everyone else's sake), check out iGetter at http://www.igetter.net/
It's an excellent download manager for OS X. You tell it to download files, press the start button and walk away. It will download two files at a time, and kick off the next one as each finishes. It recovers from lost connections, continuing where it left off. Very reliable and easy.