Doesn’t look like it was included in the ja_edenite_1.0_extensions.zip file (i know, master of the obvious) but ja-slideshow does seem to be present in the ja_edenite_1.0_quickstart distro.
/modules/mod_jaslideshow.php
/modules/mod_jaslideshow.xml
/modules/ja_slideshow/ja-slideshow.css
/modules/ja_slideshow/ja-slideshow.js
/modules/ja_slideshow/mootools.v1.1.js
If you’re in a bind, you can copy these files & attempt to install this module manually (a good how-to guide can be seen here: http://www.mambodemo.com/joomla_1.0/install_a_module_manually.html )
Or wait. I’m certain they will get to fixing this sooner than later.
Jim