Purchased Lightroom 5 from Amazon 5/14; moved it to new PC; can't develope now

Purchased Lightroom 5 from Amazon in May, 2014;  We moved it to the new PC and now it won't let me use Develop Mode.  Any suggestions?

..and herein lies the problem.
I'm assuming that the version you bought from Amazon was the standalone Lightroom 5 but you have since "updated" with a CC version. 
You won't be able to use this version unless you have a CC subscription.  Again I'm assuming you don't have one.
To use the updated standalone version you need to un-install the CC version and download the latest version of the standalone version.  You'll also need the serial number that came with your original disk.
Downloads from here:
Adobe - Lightroom : For Windows : Adobe Photoshop Lightroom 5.7.1
Adobe - Lightroom : For Macintosh : Adobe Photoshop Lightroom 5.7.1

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