QuarkXPress allows you to down-save or down-size only one version prior to the existing version of QuarkXPress used to open the document. Such as, QuarkXPress 10 will allow to down-save or sown-size to QuarkXPress 9, hence similarly QuarkXPress 9 will allow to down-save or down-size to QuarkXPress 8 only.

Please follow the below steps to down-save or down-size a QuarkXPress 10 file to QuarkXPress 9:

  1. Navigate to File > Export > Layouts as Project.
  2. From the Version drop-down menu, select 9.0.
  3. Click OK