I have Studio 2019 and don't know how to activate Studio 2022 that I have purchased. I need an activation code. I can't risk losing the 2019 licence in the process.

I have Studio 2019 and don't know how to activate Studio 2022 that I have purchased. I need an activation code. I can't risk losing the 2019 licence in the process.

If you purchased a new licence for 2022 then you will always own the licence for 2019 as well, but if you upgraded that you are returning the old one and getting a new one instead. In this case process your upgrade but don't deactivate 2019. It will continue to work for as long as 2019 is running on your computer.
This article might help you... it refers to older versions, but the principle is the same: (Missing Wiki Page)
Paul Filkin | RWS
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Thank you very much! This is very helpful, as usual :-)