I responded to this on the old forum. They are not the producers, just an unknown fan group who packaged the games together (it's kinda illegal btw lol) with community fixes. It's the same as someone providing Links 2003 with all patches etc in one download.
The HUGE problem with the NOLF series is the ownership is unknown and it's all a massive mess. It's why you can't buy the games and why they have never been released on platforms like Steam let alone updated/remastered. No one knows who has the legal rights to the games.
There was a little snippet of info that came out at least 12-24 months ago that suggested some progress was being made regarding getting the games out there again for purchase but there has been nothing since.
The games still work fine with a few fixes on likely any operating system. The issues I have on Win 10 appears to affect modern and powerful PC's with NOLF 1.
It appears once you start getting very high FPS due to the modern hardware, the game can't handle these huge increases in hardware technology. The results are stutters. I had minimal stutters on my less powerful Win 7 machine, now I have more stutters on my more powerful Win 10 machine so the theory appears to be correct.
NOLF 1 for smoothness I will play on my XP machine. I haven't tried NOLF 2 yet but it should be fine on the Win 10 machine hopefully.
Imo these are the best FPS games ever made. Pure fun to play. I hope at some point someone works out the ownership issues and then they can get to work on remastering and re-releasing these games. The market for them would be substantial.