This is the 1st I’ve heard of it, although there was a previous thread here on it.
The YouTube videos show an old version of SketchUp pre version 2013 (when the icons changed.) Other posts on the web indicate it was circa SketchUp 8.
The Paracloud.com website is nothing but a static webpage, that says “(c) 2006-2012”.
Looks as though the project may have been abandoned, or perhaps sold to some other company ? (Just guessing.)
The last tweet was in Feb of 2012:
https://twitter.com/paracloud
It was from Tel Aviv, Israel.
http://paracloud.com/about.html
The download link does not work:
http://paraclouding.com/GEM/software-download
The online User Guide is still there:
http://www.paraclouding.com/GEM/Help/2010/GemHelp.htm