InDesign securely uploads the file to Adobe’s servers, converts it to IDML data in the background, and opens it directly on your desktop.
If you absolutely cannot access a newer version of InDesign to export the file yourself, and third‑party tools aren't an option, professional conversion services exist. Companies like the Stokes Design Project and others offer fee‑based conversion services where you send them the file and they return a converted version. how to convert indesign file to older version link
Use this quick reference to understand what converts to what: InDesign securely uploads the file to Adobe’s servers,
2. How to Convert InDesign File to Older Version (Step-by-Step) Use this quick reference to understand what converts
after opening the IDML in the older version to create a new .indd file.
In the "Format" (Mac) or "Save as Type" (Windows) dropdown menu, select . Click Save .
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