The package could not be installed. No valid plugins were found.

  1. Unpack the download package called on your computer.
  2. Upload which is the actual plugin to install.

It's currently packaged this way so the documentation PDF and the unminified JavaScript source files (in the unpacked justified-image-grid folder, next to the ZIP) do not get installed. For more information, check out the following links:

This troubleshooting fix was posted in General use on June 17, 2015