Xilinx ISE WebPACK software which is needed for implementation of your designs for Xilinx FPGAs is available on Xilinx WebPACK 9.2i Download Page. Registration for download is required however it is free.
Make sure that you install Xilinx WebPACK 9.2i since Xilinx WebPACK10.1i is not compatible with the one used in the lab.