I was trying from a Windows machine. I've switched to my Linux box and, sure enough, it comes down the tube as .jar. While it's still a mystery, my particular problem is solved. Thanks.

RJL

On the download page the green download button would seem to indicate that essentialinstall.jar would be provided. However, the file that arrives is essentialinstall.zip and when unpacked I see several file folders (com, org, img, panels, packs, etc.) but no .jars. Am I missing something?