Transferring serial number to a new Mac doesn't work

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hello,
I bought the serial number for software, I bought a new Mac then needed to download LightBurn then put serial number that I have on my old Mac for me to use the software but it didn’t work.
it says activation invalid.
I need help although I bought software serial number.
how can I transfer serial number activation code to light burn software that I already bought from my old Mac to my new Mac?

Please email us directly at Support@lightburnsoftware.com so we can get you helped out with your License issue.