The most reliable way to "downsave" an InDesign file for any version from is to export it as an InDesign Markup Language (IDML) file. Open the file in the newer version of InDesign. Go to File > Export (or use the shortcut Cmd/Ctrl + E ). In the format dropdown menu, select InDesign Markup (IDML) .
How to downsave an InDesign file to open it in an older version how to convert indesign file to older version
If you are a Creative Cloud subscriber, Adobe offers a "Simple Saveback" service. The most reliable way to "downsave" an InDesign
: Once opened in the older version, go to File > Save As to convert it back into a standard .indd document specific to that version. Method 2: Automatic Conversion (Creative Cloud) how to convert indesign file to older version
