Some mods dont work if they are installed in c:\programfiles. I dont see any post about this and Left for die but you can try changing installation path:
C:\left for die or any other location.
Few guys have problem with this game if they dont have some of microsoft visusls (VC++).
Sometimes you have to install VC++ for 32 and 64 bit OS even if you use win7 64 bit, win 10 64x.
Even author of this mod on russian sites gave link for pack of VC++ for download.