If you are sure about that and Norton always sends the same referer, then i could simply make a rule for that. I'll do some googling later today i guess
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EDIT: You can download it now if you don't send any referer (or empty string). Those who had problems: Go to
http://www.msgpluslive.net/scripts/browse/index.php?act=view&id=13 and see if you can download.
Also people who have Norton or any other dodgy software for blocking referers, turn it back on and check if it works too.
If it doesn't work... Come back to this topic and click this link:
http://www.msgpluslive.net/scripts/referercheck.php. And tell me what that pages says, what browser you're using and what kind of software you use to block referers (if you know).