The avast download links are in fact load-balanced - i.e. they’re “smart” in the sense that if you click it, a proper download server is chosen for you - based on current load situation and our bandwidth optimization requirements.

You can test this by clicking a link multiple times - you’ll most likely get the file from a different server every time you try…

That’s one of the pillars of the infrastructure behind an AV company - a remarkable network of download/update servers to enable smooth updating for all users (both regular and emergency).

Vlk