Have you been on the end of adverts from AVG warning that support for version 8.5 (the current version) is being withdrawn?
Well, as per usual it seems like the staff at AVG try their hardest to make it as complicated as possible for people to upgrade from the free version 8.5 to the new free version 9.0
Most of the website is designed in a way that channels you towards downloading 9.0, so you get the latest PAID version.
Anyway, here's the shortcut link to their website. Download the 72Mb AVG9 FREE Edition install file here:
Hope this helps.