Why is my serial number invalid?

I purchased lightroom 5 and I verified that I am a student and received the email with the serial number and product code, but when I go to open lightroom it says the serial number is invalid.

The protection system is so elaborate because people try to pirate the software incessantly and sometimes the elaborateness leads to fragility or misunderstanding about what to do.
There are several different kinds of LR (educational, enterprise, standalone, cloud, etc) and if the serial number is being rejected and was bought at a legitimate reseller, rather than someone selling pirated or stolen serial numbers, then it is possible it is being typed into the wrong kind of LR or even the wrong version (4 vs 5). 
If you are using an educational version there may be a separate download you need to use—I’m not sure because I’ve never purchased an educational version of LR, but if there is a distinct version to download then there should be some instructions, somewhere (packaging, e-mail), that tell you that different location.
For a non-educational, non-enterprise, single-person standalone license, the version of LR 5 to download is the LR 5.6 link near the top left of this page: http://www.adobe.com/downloads/updates.html
If you have installed a different kind of LR, such as the CC version, then you may want to uninstall it before installing what you download from the link, above.

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    Link 2: Error "Invalid serial number" | Acrobat 9 | CS4
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    Hi Dobe29,
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