While Xilinx has moved to the design suite, older FPGA families (Spartan-3, Spartan-3A, Virtex-4, Virtex-5) require the ISE Project Navigator . Version 9.2 is a stable release frequently sought for specific legacy toolchains.
Xilinx recommends using the latest version of their software, Vivado, which offers more advanced features and support for newer FPGA devices. Xilinx Ise 9.2 I Software Free Download
