I bought lightroom 5 last december I install on my old PC. But today I buy a new Mac and I try to reinstall my lightroom with the serial number and it's said it 's wrong number.  Can have a new number?

I bought lightroom 5 last december, I install on my old PC. Today I buy a Mac and I try to reinstall my lightroom with the serial number I have.  It's said wrong number can I have a new number?

This is a user to user forum so there is no one here to provide you with a new serial number or to reset your serial number.
It is possible that you are trying to activate an installation of the Creative Cloud version of Lightroom. It is not possible to do so with your License Key. You need to uninstall the existing version that you have installed. This will not interfere with your catalog, Preferences or personal files, it will just remove the application.
Then download the perpetual license from the link below. Install and it should accept your license key just fine.
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