Even if you have a valid code, QuarkXPress 5.0 is finicky. Here are the top errors and fixes.
You then enter the Validation Code to "unlock" the features of the software. Activation: quarkxpress+50+product+validation+code+top
While version 5.0 primarily uses the validation code to install, later updates may prompt for "Activation." If the online activation server is no longer active, you may need to contact Quark Support directly. Even if you have a valid code, QuarkXPress 5
If you cannot recover your QuarkXPress 5.0 code, consider these modern paths: consider these modern paths: