You don't install Black Cipher. You extract it from the .rar file, then run it as administrator (important). You press unload hack (wait for it to say "Waiting for Combat Arms", then launch Combat Arms from the direct launcher that's in the Combat Arms folder. From there, the hack will inject itself.
NOTE -
It seems that in most cases, Black Cipher only works for Vista and Windows 7. XP isn't working for most people anymore.
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