Choose QuarkXPress as your product configuration (avoiding "Free Trial" or "Business" unless applicable).
: Be cautious when searching for or using third-party product validation codes, as they may not be legitimate or could potentially harm your system. quarkxpress 50 product validation code
If the software is already installed on an old machine, hold Ctrl (Windows) or Option (Mac) while selecting Help > About QuarkXPress . An "Environment" window may display your serial number and licensing info. quarkxpress 50 product validation code
For further assistance with older licenses, you can visit the Quark Support Knowledge Base for archived documentation. License Management in QuarkXPress - Quark Software, Inc. quarkxpress 50 product validation code