said by MooJohn :

Perhaps it's an email harvesting plan? You've got to provide a valid email that the registration code is sent to. I'll bet somewhere within the signup page that's currently 404 you'll have to agree to the use/sale of your email info. This is more likely given that the Computer Active site is not the organization giving out the free AVG.

From the page:

quote:

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We sometimes receive emails from readers who can't obtain a serial code. Please note that all the information required to do so is printed within the magazine. Occasionally it can take a few hours to receive the free download link email. Please be patient before contacting us as Computeractive is not responsible for sending out the link.
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They always say that "free stuff" is the easiest way to get people to give away their personal information. Right now it's speculation that they'll ask for more than an email but I wouldn't be surprised.

said by MooJohn :

Perhaps it's an email harvesting plan? You've got to provide a valid email that the registration code is sent to.