REQUIRED FOR TEXTURES TO WORK WITH NO BUGS!!!! Open minecraft.jar and this .zip in WinRAR or 7-zip. Drag files from optifine into minecraft.jar and DELETE META-INF folder in MINECRAFT.JAR. Then FPS will be boosted and Texture Pack will work with no bugs.
Minecraft core files: (DriveLetter:)\Users\Appdata\Roaming\.minecraft folder. You should back up your minecraft.jar file and delete all minecraft-#.#.#.jars before patching. Read the Summary for install instructions.