How Find Out What Latest Internet Security Version Is?

Hi, soz to everyone if this question is already posted, but i didn't see it.

 

Question 1: I am not asking what is the latest version (I think 16.5.? is on its way) but wondering how I am meant to tell what is the latest version out there? Can't seem to find a page on Symantec that says, the latest version is 16.2.0.7 or whatever, but maybe I am looking in the wrong spot?

 

Question 2: Do these version updates (say from 16.2.0.7 to 16.5.? happen through liveupdate automatically or do i need to do all this manually. If need to manually download and install does it happily install over the top of my existing version?

 

Cheers

Stephen