The code is available as a compressed tar file. To extract it, simply execute tar -xzvf superchicX.tar.gz and the superchicvX directory will be created. A user manual, where installation instructions and runtime information is given, is available here.
The most recent version 2.06 of the earlier incarnation of the code can be found here, but in all cases it is recommended to use the latest version 3. Information about the changes made in versions 3.X are provided in the manual.