This is a 30-second fix on their end.
Adobe's cloud service will process the file in the background and open a converted version in your workspace.
Navigate to the top menu and select (or press Cmd + E on Mac / Ctrl + E on Windows). In the export dialog box, click the Format dropdown menu. Select InDesign Markup (IDML) from the list.
Go to > Open and select the .idml file you just created. Once open, immediately go to File > Save As . how to convert indesign file to older version link
How to downsave an InDesign file to open it in an older version
Launch your older InDesign (e.g., InDesign 2023). Go to File > Open and select the IDML file.
InDesign will process the markup and open it as an document. This is a 30-second fix on their end
Click the (Windows) or Format (Mac) dropdown menu. Select InDesign Markup (IDML) . Click Save . Step 3: Open the IDML File in the Older Version
: Advanced typography engines or paragraph formatting tools found in newer editions may cause text frames to overflow or shift.
Converting an Adobe InDesign file to an older version is primarily done using the format . Because InDesign files are version-specific, an older version of the software cannot directly open a .indd file created in a newer release. Method 1: Exporting to IDML (Standard Method) In the export dialog box, click the Format dropdown menu
Adobe provides a free online tool, the InDesign File Converter, which allows you to convert InDesign files to older versions.
Converting a file to an older version often breaks the links to your local images, graphics, and placed assets. This happens because IDML files change how file paths are read. Step-by-Step Link Repair Open the newly saved older version of your InDesign file.
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Newer versions of InDesign often introduce features that older engines simply do not understand. For example, if you use modern auto-sizing text frames, advanced text wrapping variables, or complex paragraph borders created in a newer edition, those specific attributes will revert to basic default styling in the older software version. 2. Text Reflow and Typography