Trados Studio 2021 freelance licence. Impossible to deactivate licence.

Trados Studio 2021 freelance licence. Impossible to deactivate licence. Error message "There are multiple instances of this application running"

I'm switching on a new computer and when I try to deactivate my micence on the olde computer I have the following message:

"There are multiple instances of this application running".

Can someone help me with this, please?

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