When exchanging the hardware, you should take the dongle along. That way, the licenses are still registered with the correct hardware ID in our license portal. You don't need any activation ID, you just need to transfer the existing licenses to the new PLC after you plugged the dongle there. That's what the "Synchronize" button in CpStudio does:
(It is not possible to transfer the licenses to another dongle.)
By the way: A completely redesigned license activation UI will be released with CpStudio 5.8.2, where the functionality is more self-explanatory.
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