VB files location for Script Hook?

Hello everyone :)

I found this mod: http://www.gta4-mods.com/script/left-4-liberty-infection-v51-f17152 and I seem to have trouble installing it. It says in the instructions:

"Place "Left4Libertyv5.1.vb" and "Left4LibertyFireBullets.vb" into A NEW "scripts" folder you creat in /Rockstar/Grand Theft Auto Iv

for .Net Script Hook.

Place "Left4Libertyv5.1.ini" and "Left4LibertyFireBullets.ini" into the "scripts" folder created in /Rockstar/Grand Theft Auto IV"

I can only see one scripts folder in my game folder, and that's the one created by the net script hook. That's where the .dll files go (according to LCPDFR files). I've tried adding the VB files into the scripts folder, but of course to no avail.

Can anyone help? Thanks in advance...