Enter the serial number for the version of QuarkXPress from which you upgraded and ensure that the first two letters of the serial number you enter are in upper case. Then continue with installation.


When you upgrade to QuarkXPress 6, 7, 8 or 9 from an earlier version, your new serial number is linked to the serial number of your older version of QuarkXPress. This is the serial number that the Upgrade application is requesting. For example, if you upgraded from QuarkXPress 6 to QuarkXPress 8, the Upgrade will be looking for your QuarkXPress 6 serial number, not your new QuarkXPress 8 serial number. In addition, if you entered the two-letter prefix of your old serial number in lower case, the Upgrade will think that the serial number you entered is invalid.