ESF won't work on CZ, however, if you have Retail Counter-Strike, you should just install it to your /cstrike/ folder as opposed to the /Half-Life/ folder if you have retail Half-Life.
Half-Life 1 should be only a few bucks, it's quite old.
For your information, you cannot use Half-Life: Source, the upgraded version of HL1 that comes with the HL 2 pack. You must have the original HL1. But as I said, it should be very cheap now.
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