If you are using windows, you will need to download and install ImageMagick.  ImageMagick is a free third party tool that handles the conversion of many different file formats.  Its used to convert the images to small thumbnails.


I generally get the top link via HTTP.




If you want to make thumbnails of PDF or TIFF images, then you will also need GhostScript installed.  Click on the latest release.


Then click on either the 32bit or 64bit version.