MarkzTools for InDesign is an InDesign plugin that will allow you to open a higher version of an Adobe InDesign document in a lower version. For instance, an InDesign CS6 user of MarkzTools for InDesign can open InDesign CC (Creative Cloud) 2014 or open InDesign CC 2015 documents within InDesign CS6.
MarkzTools can open up newer versions of InDesign documents, without IDML, and inform users which version the document is. MarkzTools users will be able to edit the InDesign CC, CC 2014 or CC 2015 documents in an earlier InDesign version.
Publishers and creative professionals can simply select 'Convert InDesign Document" in the easy-to-use MarkzTools menu, to start the data conversion. MarkzTools users can also use the standard Command-O function within Adobe InDesign for document conversion.