Alternatively, you may work around this problem by downloading the latest iMPACT programmer from the WebPACK site as follows:
1. Go to http://support.xilinx.com/xlnx/xil_prodcat_landingpage.jsp?title=ISE+WebPack 2. Register if necessary, then select "Download ISE WebPACK". 3. Enter your log-in name and password. 4. Ensure that the Download Method is set to "Single File", and click on "Custom". 5. Ensure that the version is "4.2WP2.0". 6. Check only the CPLD Programmer box; then, click the "Download" button. 7. Click on each hyperlink to begin the download, and save all files in the same directory. 8. Run the installer executable to install.