Maybe He wants to play 1.1, many people still do.
Go to
www.esf-world.com and download the "ESF Beta 1.1 Steam Install" it should be under essentials or something like that. That's my guess. go there download it. install. Your set to play
If you want to play 1.2 or 1.2.1 just remove the folder from your hl directory and switch it to the folder you wanna play.