Realspawn@ no, it doesn't use any .fx files, at least the version you have is different from what we have here.
thorus@ I got it, problem is, that this demo uses decals, but free version doesn't support them. Do this:
// place decal function
function sc_placedecal_fx(var scale)
{
/*
if(you!=NULL){
PARTICLE* p = ent_decal(you,decal_img,scale+random(scale/2),0); // place a random sized decal at the hit entity
p.lifespan = 100;
}
*/
}
Just find this function in "blood.c", and replace them!