Downloading the latest software will do the trick.
However, any versions at or newer than these will work: Camera RAW 8.6 (PS cs6 and CC) and Lightroom 5.6
Support for Nikon D810 is available from Lightroom 5.6. So, updating your Lightroom(Help Menu > Check for Updates) to the latest version 5.7.1 should do the trick.
Let me know in case of any issues.
It's best to launch your Creative Cloud desktop app and install updates from there.