Version 6 was the first to run only on Mac OS X and Windows 2000/XP (dropping classic support). Version 6.1 was a stability update that improved performance on the newer hardware.
Then, a dialog box appeared:
For users needing these specific vintage versions—often for legacy file conversion or running on period-accurate hardware—third-party archives like Software Informer sometimes host installers, though these are not officially verified by the developer. Understanding QuarkXPress Passport Versions QuarkXPress 4.1 5.0 6.1 Passport download
What's New in QuarkXPress 2026 v22.0.1 - Quark Software, Inc. Version 6 was the first to run only