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I get an error message about plug ins.
I am using an older version of InDesign.
You didn't say what version of InDesign you're using. If the dialog says its an INDT file, it's a template created in a later version of InDesign. You need to update.
Sorry to hear about this. I agree with @Steve Werner's response. Please update InDesign to the latest version in order to open up this file. You may follow the instructions to update the app on this help article.
Hope it helps.