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You can use LR 6. Just make sure you update it to 6.5 and you'll be good to go.
Thanx a lot
Yes you can buy Lightroom 6 and update that to Lightroom 6.5, as that is the version that supports Nikon D5.
Check this article : Cameras supported by Adobe Camera Raw
Also here is the system requirement for lightroom 6 System requirements for Photoshop Lightroom for Mac and Windows OS
Thanx for your support
You are Welcome