Can 8.x be installed stand alone or do I have to upgrade from 7.x?

I downloaded the current 8.2.3.zip and there is no install.php included. A quick look in 7.13.1.zip shows an install.php file.
The admin guide recommends using the latest version, am I missing something completely here? I can’t find anything in the docs relating to this.

Cheers

You’ve read probably read the manual for v7, here’s v8: