Yet again, just to let you know that you DO get automatic downloads (for 3 years in my case - probably forever) of AVG FREE!
Sometimes, when there is a new version (eg 7 over 6), they make it look as if you need to pay, by making that bit of the screen/message prominent, but you can find AVG free quite easily by reading the message/site carefully.
So my free downloads come daily - they just install themselves and show me a little box to say they have done it. If there is a new VERSION you will be told to download it. As we all should have done by yesterday.
Here is where you can read about it and do the business.
http://www.avgfree.co.uk/doc/1My version is now 7.5.441
For home users there is no need to buy AVG pro.
Whichever antivirus you use, make sure you get it to update continuously - this way you keep abreast of the latest beasties.