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Donwload your version of Lightroom from: Download Photoshop Lightroom
if it won't accept your serial number, then you have a serial number for a different version of Lightroom. For example, If you purchased a serial number for Lightroom 5, you must download Lightroom 5, not Lightroom 6.
Thank you so much!!
I HAVE IT THE KEY NEW PC AND WILL NOT WORK
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