Hi Brett,
Here's the link for RCMS:
http://www.deliberant.com/downloads/wili/rcms/rcms-1.40.tar.tar
In order to obtain a license, please generate the license request during the installation process and send to support@deliberant.com, we will send you a license for it.
There isn't a particular reason, the demand until now has just been lower than other products/features/enhancements/etc, so it's kind of been on the back burner :)
All of the features will work with the Deliberant wili-based products.
Hope that helps, let us know if you have any other questions.
-Matt