How to install Better Zombies V1.5
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Windows
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What you need:
ModLoader
Better Zombies V1.5.rar

1. Go to %appdata% then .minecraft go into bin the into the mincraft.jar
2. Drag all the content from ModLoader.rar into the minecraft.jar 
DELETE THE METAINF FOLDER!
3. Drag all the content from the WINDOWS file into minecraft.jar
4. X out all that stuff.
5. Go to your minecraft launcher.
6. Launch game!
7. PLAY! (hopefully no black screen) ;3


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MAC OS X
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Unknown (Getting help)