AVG Support Community
David, I found it on this page: https://www.techmesto.com/avg-2015-offline-installer-standalone/
The specific file I used is: http://files-download.avg.com/inst/av/avg_free_x86_all_2015_ltst_222.exe
It seems to be working fine to me, but use at your own risk. I am hoping that AVG somehow doesn't take it down.
To Anthony S: My version 2015.0.6122 that I installed from the link I mentioned in a previous comment in ths thread self-updated last night successfully and is now version 2015.0.6172. Unfortunately the first level support people don't know why we had trouble, or are not telling us. I get the same copy and paste replys from them that everyone else has. What is being offered does not help, leads us in long wobbly circles, and buys the AVG programmers enough time to fix the problem (at least to this extent).
Moral of the story: Complain until it gets fixed and be happy when it is. Just don't expect AVG to own up to anything or offer any real help.