On 2007 manufactured Mac machines, such as iMac 7.1 and MacBook Pro 3.1 (systems manufactured in mid/late 2007), MMXCore.plugin, one of the performance optimization plugins that gets installed with Adobe Photoshop Elements 15, is not compatible. Due to this, the application crashes on launch on specifically these Mac machines.

Workaround

Follow these steps to trash the plug-in:

  1. In the Finder window, click Go > Applications > Adobe Photoshop Elements 15 > Support Files.

  2. Right click Adobe Photoshop Elements Editor.app and select Show Package Contents.

    Show package content
  3. Navigate to Contents > Required > Plug-Ins > Extensions.

  4. Search for MMXCore.plugin and move it to trash.

  5. Launch Photoshop Elements 15.

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