Windows/Linux Instructions:
- Locate your minecraft.jar file. On Windows, it's in %APPDATA%/.minecraft/bin
- Create a backup of minecraft.jar
- Open minecraft.jar in an archive editor (WinRar/7-Zip/etc)
- Delete the META-INF folder.
- Copy (drag and drop) the .class files from the downloaded zip file into the jar file, replacing previous files.
- Run Minecraft and test!
- Or you can always use MagicInstaller (Google it) ^^
- Locate your minecraft.jar file. On Mac, it's in <home>/Library/Application Support/minecraft/bin
- Create a backup of minecraft.jar
- Rename minecraft.jar to minecraft.zip and double-click it to extract the contents
- Rename the resulting folder to minecraft.jar and open it
- Copy the .class files from the downloaded zip into the minecraft.jar folder, replacing previous files
- Run Minecraft and test!