Nikon Camera Control Pro 2.19 does support the D750 - and the D5200. I've owned and upgraded it (freely) since version 2.0 and Nikon have always been pretty prompt in updating for recently introduced cameras. It is of course somewhat costly at around £135.95 from WEX.
A good alternative which I also use is "ControlMyNikon Pro" from
Tetherscript. The current version 5.0 is US$49.95 so a lot cheaper than Nikon. This version does not support the D750, but version 5.1 shortly to be released will do. You could download a 14-day trial of 5.0 to use with your D5200. In the meantime, I'm testing 5.1 beta which supports the D750 very well. Why do I have two applications? - ControlMyNikon has an integral focus stacking capability and several more neat features that CCP doesn't have. It took some persistence to get over some of the newly introduced "features" in version 5 during the testing period but the release version was pretty good. Version 5.1 beta has cured many bugs, mainly in the user interface, and would appear to be pretty stable as it is. I don't want to put you off V5.0. The bugs are not that easy to find!