Unsupported version of Adobe InDesign (v. 16)

Hi, I have an idml file which is (probably) created with InDesign 16.0 (at least the reference pdf is, so I assume that this one is, too). My client opens the file without problems in Wordfast but I don't manage to open it in Studio. I have tried already all the tricks which have been suggested for earlier versions in other threads (mainly Process unsupported file versions) and I updated my Studio from version 2019 to 2021, but it didn't help either. Any further suggestions?

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