slightly different for elements 4_To install with Adobe Photoshop Elements 4.0:
1. Exit Photoshop Elements and Adobe Bridge
2. Open the Finder
3. Navigate to the root of the local disk (not the user's home folder).
4. Navigate to: (Please read directory carefully)
Library/Application Support/Adobe/Plug-Ins/CS2/File Formats
5. Move the existing plug-in to another location (for example, a new folder on your desktop). Ensure you keep this version in case you need to revert back.
6. Copy the Camera Raw plug-in, Camera Raw, from the download into the same folder as in Step 4.
7. Launch Photoshop Elements or Adobe Bridge.
hope this helps.