I have Lightroom 3 and Photoshop 5.5 (I know, I know). Last weekend I bought the Nikon d750. I can't open the RAW files in Lightroom OR Photoshop. I thought I updated the camera raw plug in's for both (PS: 188.8.131.52, LR: 6.6) but I might be a little out of my league, technically speaking. HELP! I reallyyyyyyy don't want to upgrade this software yet!
The D750 is much too new for Lightroom 3, so there is no way to import the NEF files directly.
You have 2 choices:
Since you are upgrading your camera, we suggests you to also upgrade your Adobe Software's to the latest as well.
In case if you wish not to, Adobe provides a Free DNG Converter which you can use to open the RAW Files, the Latest version is Ver 9.1 and you can download it from here.