I have a serial number from the CD Rom for Lightroom 5 but I can't use the serial number to license the software I downloaded online.

Hi,

I've recieved a free Adobe CD Rom for Adobe Lightroom 5 after buying a new Samsung Camera,

as I do not have a CD Rom department in my laptop, I've downloaded the Adobe Lightroom online.

After downloading, I was trying to license the software by the given serial number at the CD Rom, however it doesn't work.

Please kindly assist.