Which version of mac os x?
We need more details about what happens when you try to run the installer for photoshop cs5.
Is this from the cs5 install disk or a download of cs5?
From the download, I click on the install icon. The initializer begins, then a message that the download is unable to initialize.
Is this just for photoshop cs5 or the cs5 creative suite?
You did download the mac version?
Did you try restarting your system and trying to run the cs5 installer again?
It's possible the download did not complete or is corrupt, so you might try a fresh download of cs5 from here: