You could go to
www.avg.com/ and click the link for AVG2015 free which is
www.avg.com/free-antivirus-download
But go to the source, don't trust links on forums, even from people who tell you not to trust them!
Edit:
I've gone to the source for AVG on this macgine. The latest version of the program itself is 2015.0.5557, released on October 23.