A new 4.2 branch has started for both
Xic and WRspice. The binaries are installed in a
different location among other changes,
read the release notes:
Mac OS X support now extends to El Capitan (10.11) and Yosemite
(10.10). Mavericks (10.9) is no longer supported.
There is a new LinuxRHEL7_64 distribution channel for CentOS 7
Generation 4 XicII and Xiv are now available. They are
no longer separate distributions. Just install Xic, and read this.