Dan , I also have win7 64 and was getting crashes with another great crysis MOD (The Worry of Newport) - Turns out my game (MAXIMUM EDITION-retail) wasn't fully patched.
You may need to patch up your game from 1.1 ( I got Patch 1.2/ Then a small HOTFIX patch for 1.2 / then patch 1.2.1) after this I've encountered no more probs with loading up MODS (although I've not tried HUNTERS LIFE-I'm here now to DL it and give it a go :)
Sometimes it's something simple (and easily overlooked)
GOOD LUCK fella -ZTK
Zetetick
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