I followed the Installation Guide when I made my fresh install of 4.2. Some of it is not accurate any more. Actually it has not been accurate since a long time now I think.
a) In the section Software: Debian and Whonix are not options there any more. This choice has been moved to later in the install.
b) Create Your User Account: this has been moved to later in the install, it is part of the Installation Summary now.
c) Initial Setup section: the screenshot is not accurate any more and the description does not make reference to new options.