while trying to add a plug-in (install trados-compatibility-and-migration-power-pack) and so "updating", I am asked to do activate the product

I wished to install trados-compatibility-and-migration-power-pack
So I noticed that I did not have the compatible version of SDL Trados Studio 2021 required, I had "16.1.4.4184" version of Studio.
Searching for "updates" from within Studio 2021, I was told that there was an update and I clicked and so TradosStudio2021SR2_16.2.12.9338.exe was downloaded. I clicked on it installed the exe. Now when I open Studio, it requires activation.
What should I do??? (When I update DVX,Wordfast Pro etc. etc. the application does not need activation.)
 have indeed my activation number, but I fear it would count as a new user (I don't even know if it would work, not having deactivated the previous one).
But why there was no message about it? It is just an update (needed for a plug-in), not a paid upgrade. 
Thank  you!
Ilde
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