Ok I found out about this mod and was interested in playing it. I had half life for the longest with the original key code and orignal box. I install Half life and then i installed the 1.1.1.0 patch. After that i installed ESF. I go to play and it asks for the key code. So i go to put in my key code that came with the ORGINAL half life and it wont work. Can some one help me?