Summary- As in the previous versions QuarkXPress allows down-save or down-size to only one version prior to the current version. Similarly QuarkXPress 10 also allows to down-save or down-size to QuarkXPress 9 only.
Steps to down-save or down-size a layout in QuarkXPress 10:
- Navigate to File > Export > Layouts as Project.
From the Version drop-down menu, select 9.1.
- Click OK