there's two cold steels ? wtf ? did he see the name was in use already and just put it in caps to get around it ? ohwell.........
i will put this in easier context for you if you don't understand so well
1.run half-life 1 once before setup. If it's the first time running hl then run the hazard course and then install esf as i think that creates a nessacary folder for mods if i am not mistaken. Or just run half-life oonce before installing esf
2.Install esf , your problem of the install button being not being clickable at the installer should now be solved provided you have pointed the install at the right steam account that you ran hl off once before
3.your'e done , PLAY , GET GOOD AND PRACTICE SO YOU DON'T GET OWNED BY RANDOM PEOPLE OF THE WORLD \o/