Our Technical Support Portal has changed as we have moved to a new platform. Please visit support.quark.com to access your support tickets or to log a new ticket with us. All our existing customers should look for an email from firstname.lastname@example.org for activation of their New Support Account. If you face any difficulty in accessing the new portal, please write to us at email@example.com
Yes, on Mac OS you can open the different versions of QuarkXPress at the same time but on Windows it is not possible. On Windows you can open only one version of QuarkXPress at a time. It all depends on the OS, as the Mac and Windows are different from the structure; they allow the applications to run on differently.