If I can’t open Trados and need to reinstall it completely, how can I deactivate my licence?

I have a Freelance licence for Trados Studio 2021, but I get a message error (Key already exists) at the « Loading File Display » stage when I try to open it. I would like to deactivate my licence, but I can’t even reach the option in the application, since it crashes before. Any solution?

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