Error: "Critical errors were found in setup - Incompatible payloads already installed" (Photoshop Elements 6 on Mac OS)

When you start the installer for a retail, educational, or volume license version of Adobe Photoshop Elements 6 on Mac OS, the installer returns the following error message and does not proceed: "JavaScript Alert: Critical errors were found in setup - Incompatible payloads already installed. Please see the Setup log file for details" Files from the Photoshop Elements 6 trial are installed on your computer. These files... Read More