Installation of Trados Studio 2024, error message when trying to open Studio 2021

Trados Studio 2024 Freelance Plus
We try to install the second licence on my computer.
I still have  Studio 21, which I can't open any more:
Sdl.Desktop.Platform.Services.ITelemetryService could not be started.
We had one info to rename a folder (16 to 16 old), which we did.
Without success, the error remains.
Our company is LinguaScript in Heidelberg, Germany.
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