Image within Image Extractor

I've developed a novel GIMP plugin that should allow all owners of my January 2023 Nifty Gateway release to decode the hidden images themselves
  1. Log into Nifty Gateway and download the full-size image. It should be > 30Mb.
  2. Download and install GIMP (GNU Image Manipulation Program) from https://gimp.org
  3. Download the plugin file here and place it in the GIMP plug-ins folder
      If you don't know where the plug-ins folder is
    • Open GIMP and navigate to Edit->Preferences
    • Scroll down in the left hand menu and click the plus sign next to Folders to expand the group
    • Click Plug-ins under the Folders group
    • Note the folders listed.
    • Copy the file to one of the folders listed
    • If you are running linux, ensure the file is executable.
  4. Using GIMP, open a steganon artwork which has an embedded hidden image
  5. Click menu item Filters->steganon->Extract Hidden Image
  6. Wait a minute or so to see the extracted image.