ESF is a Half-Life mod, and as such, Half-Life is the foundation of ESF.
What you're asking is equivalent to taking an elevator to the 20th story of a building, then saying "I want this on the ground level!" Okay, we'll rip it from the rest of the building and drop it onto the street. Everything'll work fine!
Kama said:
Might I inquire as to why you think this?
Because he doesn't have Half-Life. He made a thread earlier asking where he could download it. =/
Just go buy the game. The team isn't going to redesign their entire project so you don't have to buy a 7 year-old, $20 game to play it.