License Key switch to new MacBook

How do I deactivate my old MacBook Air and be able to use that key to install on the new MacBook… Currently using the other key on IMac?!

You must deactivate the computer you no longer use, then you can use the free license for the new computer. It all takes place in the license portal, here on the page, top right.

Alguém me pode explicar como posso proceder ao pagamento da licença?

The quickest and easiest way is to go into Help/License Management on the computer you want to deactivate and click the “Deactivate License” button:

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