Hello tolios
there will be three products for the home user namely avast free, avast professional and avast suite (names might be different).
the suite version has the firewall. free version doesn't have behavior shield and firewall. obviously pro version doesn't have firewall but the remaining shields.
alpha version is the one used for testing the product internally in a company which develops or it is a devs version. beta is the one which public can use to test on their test machines and not live machines. so you better wait until version 5 is out of beta.
any more questions?
nmb