Activation?

SDL Trados Studio 2021 Freelance Plus

A couple of months ago my PC died. I had it repaired, which involved re-installing Windows. Although the Trados Studio 2021 icon remained visible post-repair, so I could try to open it, it didn't recognise my license as 'active' and I was therefore unable to use it. I tried various things. It appears to be de-activated now on my PC. 

I want to activate it on my PC again so I can use it, but finding it very diffcult to understand what to do.

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