How to make available both Trados Studio 2019 and 2017 again?

I have used both Trados Studio 2019 and 2017 on the same PC, after upgrading the license of 2017. Unfortunately, my PC crashed several days ago. I managed to prepare a new machine and activated 2019 by force resetting, but 2017 went into trial mode.  How can I activate 2017 normally?

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