Sometimes you launch Photoshop and get this error:
One or more files in the Adobe Application Support folder, necessary for running Photoshop, are missing. Please run the Photoshop installer and re-install Photoshop.
This is the dialog of four lies:
Lie #1: A file is missing.
Lie #2. The file is missing from the Application Support folder.
Lie #3: The file is necessary to run Photoshop.
Lie #4: You need to re-install Photoshop to file the problem.
The problem is that /Library/ScriptingAdditions/Adobe Unit Types.osax isn’t loading. It’s possible the file is actually missing, but it’s more likely that you’ve upgraded to Snow Leopard.
Snow Leopard requires 64-bit versions of every plug-in, including OSAXes. The version of Adobe Unit Types that shipped with CS3 and CS4 is 32-bit.
To fix this, download the 64-bit version of Adobe Unit Types, drag it to your ScriptingAdditions folder and launch Photoshop. Problem solved.