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2021 installed, 2019 also, but 2019 does not accept or automatically copy 2021 licence

I have Studio 2021 installed and running. For a specific project, I now need to work in Studio 2019.

I installed the latest version of 2019 again, closed Studio 2021. This was what was described in another post as the solution to make SDL Studio automatically use the 2021 licence when opening 2019. Unfortunately, this does not work on my machine.

Studio 2019 only runs in test mode, and if I try to copy my 2021 licence into the licence activation field, this does not work either. Any ideas or help? Thank you!