Which version of Lightroom do you have? The D5 became supported in version 6.5.
So if you have LR5 or older, you need to upgrade to LR6 or CC, or you can use the free DNG converter to convert the NEFs to DNGs that can be read by your current LR.
I have the stand alone LR 6 and have been trying to update to the 6.5.1 with no luck. Has anyone helped you to resolve this issue?
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Could you please try updating manully from direct download link Keeping Lightroom Up-to-Date (choose the link as per your OS)
Also we recommend you to create new query for issues different than what is discussed in the thread.See ASK- Forum Success Guide: Efficiently using the forums
Let us know if that helps.
Thanks for posting the link as I needed to update manually as well.