Had to do some extensive research because theres not much info on the lithtech enterprise package.
So here is to do away with all the fud -> yes it was released by touchdown entertainment way back in 2003 before the site became defunct (so no it is not a leak, and is perfectly fine to use).
The development version of NOLF2 that came with the source code is only a demo (1st level of the game), but allmost all the assets are in the game directory so you can use it for making mods for NOLF2. The lithtech engine version 69b that can be built with the source code does not work with current full NOLF2 game, it is a neutered (but strangely more modern) version of jupiter not jupiter ex as some believe, It lacks bink's sdk for instance (so we need to grab ffmpeg again it seems...).
While i was able to load the game menu with the full game it crashes when loading a new game (yes i did replace the game dll's

), so i tried debugging it and ran into something odd.
It seems the Lithtech Engine has a hardcoded break which only allows the demo header from the demo game directory, im still trying to hunt down where in the source this happens.
Besides this the SDK is allmost a full game studio for jupiter engines, with a lot of tools to setup your own maps or mods, and samples that are worth a look if just to see how touchdown entertainment did things

.
The source needs visual studio .NET 2003 sp1, you might have luck building it with visual studio 2005 or 2008 as well,
but anything newer than that and you will need to rewrite a LOT of the source code (yes i tried and succeded to some extent) it builds but is a lot more crash prone than the 2003 build

.
Also some of the Tools need very outdated compilers like borland cbuilder 5 (crud.exe) i managed to build it with borland cbuilder 6, but any version beyond that nessesitates a rewrite of the source code, fortunatly it works fine in win10 (the tool not the compiler, i had to install that one in a virtual machine with XP sigh...).
SO if anyone wants to have a go at it i can upload the SDK to my site, and you can start hacking away

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