Free AVG No Longer Free?

A few days ago, one of my sisters decided it was time to scan the secondary family computer. That computer's running on Vista and has the free version of AVG. According to her, AVG found something, but refused to remove it unless she upgraded to the paid version. Since Sis is as tech savvy as a chicken, and I've never had problems with AVG even when I had the free version, I didn't think much about it. I looked information about it this morning because she was very insistent that the problem was real. Turns out there's at least one other person in the world with a similar problem (4th complaint).

It seems to be a recent development. Does anyone know what's going on with AVG? Thanks.

I mentioned that possibility to her yesterday. She told me that 1) she was not the one who installed it, and 2) she's absolutely, positively sure that it's not a free trial.

I may have to check that out myself; as I said, Sis isn't very tech savvy. I may have to do it secretly, too. The person who installed AVG on that computer yells if you so much as hint they made a mistake.