I need to transfer my licence to a new computer, how do I proceed?

I am getting a new computer and would like to deactivate my licence on the existing computer and activate it on the new one. In the past I seem to remember that it was possible to simply deactivate the licence in my account, but I don't see that function anymore. I also went to "Help" directly in sdl trados and tried to deactivate there, but that did not work.

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