Here is a simple tutorial on how to install mods, even for those whom suffer a brain disorder.
1)Step one:
Open up your Resident Evil 4 directory. It should be (if you installed regularly)
C:\Program Files\Capcom\Resident Evil 4
2) Look for the following files:
bgm.dat
em.dat
emjp.dat
etc.dat
evd.dat
font.dat
ogg.dat
op.dat
rel.dat
ss.dat
st1.dat
st2.dat
st3.dat
st4.dat
st5.dat
xfile.dat
xscr.dat
They are in your main re4 directory. The main re4 directory is located @
C:\Program Files\Capcom\Resident Evil 4
3) Download this file
http://www.emit.jp/gca/gca_eng.html
It can extract the .dats
4) Take each .dat and rename them to .gca ie: xfile.dat > xfile.gca
5) Open the new .gca file in that program by going to file> extract and then finding it. After that, a window opens up. JUST HIT OK. If you touch any of those setting, it could mess it up.
6) After that happens, take the folders in the mod and copy/paste them into your re4 directory. The mod should work now.
Most mods use this procedure. If it doesn't, it will say in the mod on how to.