We are moving to a staged release model. First, Haskell-based tools, including the compiler, IG, and the wiki, followed by backends Choco3-based and Z3-based, finally followed by the web tools. This will allow us to make more frequent releases of the core components on which all others depend.
The binaries for Win, Linux, and Mac can be downloaded from Clafer Tools - Binary Distributions. There's also a "portable" distribution for Win which includes preconfigured Sublime Text 2.
For feature modeling, see Guidelines for Feature Modeling using Clafer.
For more information about the release see the clafer.org post.