Clients who have CS6 can't open any IDML files I create/export in CC2018. They receive an error message saying the format is unsupported or a plug-in is missing. IDML files created/exported from an earlier version of CC (2017) work fine.8 votes
We have released InDesign 2020.0.1 with a lot of stability fixes. We recommend you to upgrade to latest version (if you’re not already on it) as it is more robust.
If you still face this issue even after updating, please send the following information to firstname.lastname@example.org:
• Reproducible Steps – What were you doing when InDesign issue occurred?
• Video recording of the issue?
• Is(Are) the issue related to a specific document(s)/asset(s)? If yes, could you provide the document(s)/asset(s) to us? Please package the entire document (To package the document, choose File → Package…)
Adobe InDesign Team
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