Never rely on native .indd files for file transfer. If you are a designer, make it a habit to click "Include IDML" in the Package dialog. If you are a recipient, demand IDML files as a standard deliverable.
It will show an error message and refuse to open. how to convert indesign file to older version
Even with the IDML method, issues arise. Font substitution is the most frequent: if the older version lacks a font used in the newer document, it will be replaced, potentially breaking the layout. Always convert text to outlines for critical logos or headings, or include font files (respecting licensing) in the packaged folder. Additionally, linked images saved in newer PSD or AI formats may not render correctly. Flatten or rasterize complex linked graphics to a universal format like TIFF or EPS before conversion. Never rely on native
The most effective method is to ask someone with the newer version of InDesign to export the file to . IDML is an open, interchangeable format that older InDesign versions can open. It will show an error message and refuse to open