You can evaluate Xilinx software for 30 days. An evaluation copy of the current version gives you 30-day access to all applications within the ISE Design Suite.
The Xilinx WebPACK tool is also free. Although the WebPACK software does not expire, it only provides access to limited applications.
Both the evaluation and WebPACK software can be downloaded forfree at:
If you are unable to download the software and require a DVD, please go to theXilinx Downloads page and locate the "Order DVD" link, click theISE Design Suite DVD link to order your copy.
NOTE:Xilinx only provides DVDs for the most current version of the software.