I am still using AVG 7.5 on one PC and it is still able to get updates but they have to be done manually. Support was supposed to stop last June, but they extended it to November 1, and it hasn't been killed yet. Maybe on New Years Day?
You can download the loader for 7.5 at File Hippo. I cannot vouch for its integrity as I got my version from Grisoft.
http://www.filehippo.com/download_avg_antivirus/4029/
However, the AVG downloads have always been just installers. They go to Grisoft to download the actual program, so I don't know if the above is still supported.
If you try it, let us know if it works.
And as a side note, Avast seems to work nicely and will be my option when AVG support stops. I hear AVG 8.0 is gotten too big and tries to do too much for its own good..