I have tried everything to make my minecraft.jar folder work but it just won't. I tried to force update minecraft with the mine craft.jar folder but it won't work it keeps showing me an error message. I tried the unarchiver, zipeg, and changing the minecraft.jar into .zip but it won't work. and i really wan't to add mods like optifine. But i just don't know what to do please help. and i also tried using terminal but not successful please help (on MAC)
Delete your whole minecraft.net folder, make sure you save all your progress then at the launcher, ensure you click force update and redownload the whole file again. What error message is it showing?
Minecraft.jar folder won't work (MAC)