Trying to install Lightroom 5 on 2nd device, LR will not accept my licence code

I'm switching across from Aperture to LR5 and have successfully purchased and installed LR5 on my desktop. I have now downloaded a trial version onto my laptop, but when I tap in my licence code it will not allow me to proceed. I understand LR5 will allow me to use it on a max of 2 devices but clearly I need help!

I tend to agree with John, this is usually the issue (particularly since Adobe seem to hide the perpetual version download). 
Also the latest version is 5.6 (both perpetual and CC), not sure where you could have downloaded 5.4 from.
This the site for the 5.6 perpetual version for PC:
Adobe - Lightroom : For Windows : Adobe Photoshop Lightroom 5.6
And this for Mac:
Adobe - Lightroom : For Macintosh : Adobe Photoshop Lightroom 5.6
I'd try uninstalling the 5.4 and then using the relevant link above.  Good luck.

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