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Sorry that you're not able to enter and register your Photoshop Elements 2019 serial number.
Please take a look at this article https://helpx.adobe.com/in/creative-suite/kb/error-serial-number-valid-product.html and let us know if that helps.
To migrate Photoshop, please see https://helpx.adobe.com/in/photoshop/using/preset-migration.html
For Lightroom, https://helpx.adobe.com/in/lightroom-classic/kb/catalog-faq-lightroom.html#HowdoImoveacatalog