How do I install Lightroom on a second computer?

[botelloal]

I have Lightroom 5 installed on my laptop and now I'm trying to install it on a desktop. When I go to the website on the instructions to try and active it, it tells me the serial number I enter is invalid.

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[John T Smith · Accepted solution]

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

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