ßeta is correct - you need to register on the Avast website to obtain the free key. Apologies for not including this on the CD interface.
When you register, don't forget to mention that you found out about the application from PC Advisor magazine!
I haven't received the email from you, but it appears that you've emailed richard-clooke. The email format is firstname_surname - so I think the email you sent will probably be returned as undeliverable. If I did receive the email, then please accept my apologies for not responding.
On another note, I've finally completed the redesign of the cover disc interface, and the May issue will include this new menu system. It's PDF-based - so I've been able to include more information on each of the main programs on the discs.
I'll be very interested in your opinions on the new menus, so please do let me know!
Cover Disc Editor