I just thought you might like to know that manual updating via a download is now possible with the home products.
BUT ONLY THE SUPERDAT WORKS - the second tab on that page.
During the installation if your engine is already up to date it may throw up an error, ignore that and dismiss it.
You should find on redisplaying the SecurityCenter that the DAT for VirusScan has updated.
This is only for VirusScan or AntiVirus as it's now called. Updates to other components and to SecurityCenter itself still have to come from the regular update methods.
This just happened yesterday so I am posting this in as many threads on the subject that I can find.
All the best ;-)