For the D750 you need at least LR 5.7: https://helpx.adobe.com/creative-suite/kb/camera-raw-plug-supported-cameras.html
You can convert to DNG using the free DNG converter and import the DNG's into LR, or upgrade to the latest LR6.
Thank you ,Nef is it not changed at all when it passes to DNG ?
RAW data (i.e. NEF) is never changed in LR nor in DNG converter
Ok, thank you for your reply. I find still unacceptable from adobe to have to make such a thing to happen that we want ...
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Adobe made a free solution available to you: the DNG path.
The update cost to the latest LR6 version with a bunch of additional features compared to LR4 is as low as about 80 bucks.
IMHO, thats acceptable.