An upgrade version has its own serial number, but relies on the serial number from the original purchase to validate that you are eligible. If Lightroom 1.4 is still installed then the installation of Lightroom 5 will find it. Otherwise, you will need to have that serial number available during the installation and activation process so that you can enter it. But Lightroom 5 will have its own serial number. If you purchase a boxed Lightroom the serial number should be somewhere in the material that came in the package. If you purchased a download version then you should have received an e-mail with your serial number or at least a redemption code that would have instructions on how to retrieve the serial number.
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