Do i have to bye it

do i have to bye ESF first than go get the latest virsion or what i downloaded it before and said it couldnt find the folder or something i don't remember it was a while ago but i need help someone please help me

?? ESF is a mod for HL and it is and will be free to the public. As for d/ling it, find the link somewhere on the page and unzip it into your Sierra/Halflife folder.

I think he's saying that he doesn't have Half Life. Go to the store and buy the HL engine first then you can play this free mod.