Moving GoodTask to other Mac

I have installed GoodTask on my new Mac. I have bought the app for mac previously and used it succesfully on my old Mac.
When insatlling GoodTAsk I get a message that the trial period soon is over. How do I get my old license working on my new Mac??

Hi @Hakan_Billig, thanks for using GoodTask.

I assume you have downloaded the trial version on the Mac? Mac version of the app is available on Mac App Store as a paid app. You can re-download it in Purchased section that you can go by clicking your name on bottom left.