for installation on a windows machine, http://psychtoolbox.org/download.html#Windows has a 9-step procedure (“1. Download subversion, 2…”).
“Alternate download as a zip file.” This alternative option simply requires a mouse click (plus, I guess, inclusion of Psychtoolbox in MATLAB’s path).
Surely the alternative option is much simpler. It takes roughly 60 seconds with my current wifi connection. Why would anyone bother with subversion and all that?