Avast Free program version 2015.10.0.2208
At the "Overview" I also get a warning that Avast is expiring soon, with a box to register. But, if I click that I get directed to the store and the *Only* option there is a paid upgrade.
I guess I'll have to go the offline route, or register at the page you mentioned.
I'll be getting a new PC soon, Windows 7 at the least. I like Avast, and I've used it for years, but if they don't want to offer the free version anymore I'll have to check out other alternatives. I've never had this much trouble registering before.