Launch Adobe Bridge and browse to the location of the InDesign file. Select the file within Adobe Bridge and then on the right side metadata panel, check the version of InDesign with which the file was initially created or last modified. Then accordingly, download the trial version of InDesign from prodesigntools.com. Open the file in that version. Then export to INX or IDML depending on the version. You'll be able to use the interchanged format of the file in later versions of InDesign.
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