How do I downloaded Lightroom on my second Mac but it says that it cannot validate my serial number?

November 1, 2015, I bought and installed Lightroom on my Mac and everything went well.  Now, I just downloaded Lightroom on a second computer and when it asks for my license #, he said: it cannot be validated.  Help, please

What version of Lightroom?

Cloud or a version of serial number?

Invalid License http://helpx.adobe.com/creative-suite/kb/error-serial-number-valid-product.html

-http://helpx.adobe.com/creative-suite/kb/invalid-serial-number-cs4.html

- and http://forums.adobe.com/thread/1038761

Tags: Adobe

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