Hi,
Output Enhancement XT for QuarkXPress 7 is not available. However, Output Enhancement XT for QuarkXPress 8 will be available for download in April, 2010 at Quark Labs (http://labs.quark.com).
However, you can achieve similar results in the default QXP 7 or 8 application by going to Edit > Output Styles and creating a new PDF output style that meets your requirements. When you are ready to output the PDF, simply go to File > Export > Layout as PDF and select the PDF Style you have created, in the dropdown menu of the Export as PDF dialog. Let me know incase you have any further questions.
Thanks!