installing psychtoolbox mac os x v10.9.4

1
I get this message:
Error using DownloadPsychtoolbox (line 198)
Your operating system is not supported by
DownloadPsychtoolbox.
2
my guess is that you are using an old or outdated DownloadPsychtoolbox.m file.

make sure you are using the one you can find on the "Downloading and Installing the Toolbox" page of the official PsychToolbox website:

Psychtoolbox Wiki: Psychtoolbox-3