Re-install Trados 2021 after OS-crash

Dear every body, 

I was having problems with my laptop and Windows 11 was installed. But I did not deactivate my trados 2021 license before the installation of Windows 11. 
Now, I'm trying to deactivate 1 user of my license in my SDL-account, so that I can re-install/install on the new laptop, but that is not possible.

Could you please advice me how to proceed to re-install Trados?

Thanks in advance for your answer. 

Elisabeth

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