Just to complete the picture:
If you have access to InDesign CC v9.1.0, you have also access to InDesign CS6 [cloud edition] (as part of your cloud subscription).
To stay compatible you could use InDesign v8.0.2 as well. Or your copywriter will switch over to InDesign CC.
Ok thanks a lot - then I´ve misunderstood the compatibility between these two versions . I thought that Indesign CS6 would be able to open Indesign CC - but then again you can´t have it all:)