I'm normally against piracy, but it's a possibility in this case, as the software is no use without the unlock codes. I'd make sure I was running antivirus if I did download it, though - you've got to make sure that the software is really what it says it is, and hasn't picked up any nasties along the way.
Note that there are several different CNE 2007 NT (v9) DVD's. One for updating an existing installation and one for installation from scratch.
Also take the warning from Tobermory seriously. There are plenty of infected garbage at Piratebay! If you can get a copy from someone you know you should go for that.