esf will never go to the source engine as it's been stated various times by the dev team. It will always be on the half-life 1 engine. Just go buy half-life in a game store for $10 - $20 or $9.95 over steam.
u cant install it to the source engine only for hl1 engine and their never gonna make this game to the source engine cuz that will require an hell load of work
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