1.– You are already running 9.0.2. Check your splash screen ("About Photoshop"); or
2.– You have moved the Photoshop icon out of its folder, or the Photoshop folder out of the root Applications folder, or buried that folder inside another subfolder.
There might be another issue if your machine is a MacIntel.
James it sounds like its a problem with the Mactels. As this is a user to user forum and not many of us have Mactels, so we are unable to give advice on the problem.
The install completed properly on both systems. No files were moved from their default locations and the other applications of CS2 updated with no issues whatsoever. Photoshop functions as advertised with the exception of the update and a few issues that we are trying to update to fix.