Photoshop CS4 stopped reading CR2 files.  Update failed.

My Photoshop CS4 quit reading CR2 files from my Canon EOS 5D Mark II.  Photoshop update with new raw version failed.  Please advise.
And many thanks!

This screen shot shows the correct path to the appropriate folder in CS4 on the Mac, which is not called "ACR folder" (that must be a Windows thing).
The version of ACR in the image is older (5.2, obsolete by now), because it's a screen shot from many moons ago.
The important thing is to start the path in the ROOT LEVEL Library, not your username or home Library:

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