Trados 2021 crashing - idml files

I have re-installed Trados on a reformatted laptop and I still can't work with idml files. Trados crashed suddenly and without warning, nothing I translate gets saved. I've ticked the 'unsupported file' option, Trados crashes after that.

Out of frustration, I installed Trados on another machine to test if the problem persists and it does, every time I try. I have never worked with idml files before, so I guess the Trados version is corrupted (Studio 2021

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