Can I make an update server in my LAN for home?

My school’s Internet bandwidth is low, so because many of our teachers/students using avast home, I think if I can set up an update server for them, it will be nice.

I do not need management function, just an update server, our users can update their avast from LAN.

So, is this possible, and if yes, how can I make it?

Thank you. 8)