Re-istalling Lightroom: Serial number invalid for second computer download

I recently had to wipe my Macbook Air, which removed my purchased version of Lightroom 4. I am now unable to reinstall/download Lightroom 4, despite having only previously downloaded the software to one Mac. The serial number is coming up as invalid. How can I re-install Lightroom 4 onto my Macbook Air?

Hi Emma,
Kindly follow the link and let me know if it works: http://helpx.adobe.com/creative-suite/kb/invalid-serial-number-cs4.html
-Ankit

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