- Retrieve your missing serial number from the version of QuarkXPress you’re currently running
- On Mac OS: Launch QuarkXPress, press the Option key, and choose QuarkXPress > About QuarkXPress®. The serial number displays in the QuarkXPress® Environment dialog box.
- On Windows: Launch QuarkXPress, press the Ctrl key, and choose Help > About QuarkXPress®. The serial number displays in the QuarkXPress® Environment dialog box.
- Complete the following form and we’ll do our best to help you find your missing serial number. Please note that you should allow up to five working days for a customer service representative to contact you.
View our FAQs to find out more about upgrading from QuarkXPress 3, 4, or 5.

