If you have the purchased version of avg then yes the updates are free as well. I think they also have a free version, or used to, that you can update as well, but its not as good.
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AVG Anti-virus 8.0:
(http://free.avg.com/ww.download-avg-anti-virus-free-edition)
AVG Free is available free of charge to home users for the life of the product. It's an easy-to-use solution to...
here is the browser link to download AVG 8.5 (there is now a newer version). copy and paste into your web browser;
http://www.avg.com/gb-en/download-8?prd=ais