Sep 30, 2011 - CLASS into the minecraft.jar FOLDER; Delete the META-INF folder. This video is fairly old, but installing mods hasn't changed since it was. If you're wondering how to install Minecraft mods on a Mac, check out this video tutorial I made! It goes over everything you need to know to go about installing mods on a Mac. Hopefully this helps! [Easy] How to Install Mods on a Mac - Minecraft 1.10.
I was trying to get the Minecraft mod 'Minecraft Is To Easy' (MITE) for Mac and can't get it to work. I tried following these steps,. I would download MITE, unzip the file. paste the 1.6.4-MITE folder into the minecraft 'versions' folder.
copy the version 1.6.4.jar into the 1.6.4-MITE folder, rename it to '1.6.4-MITE.jar'. unarchive the 1.6.4-MITE.jar then paste the contents of the 'class' folder (that was was inside the 1.6.4-MITE folder) into the unarchived 1.6.4-MITE.jar and keep duplicates. delete the META-INF folder. turn the unarchived 1.6.4-MITE.jar back into a.jar using the terminal. Then I would run Minecraft and click 'Edit Profile' and change the version to 1.6.4-MITE and click play. Minecraft would run but nothing would be changed except that it was now running version 1.6.4, when it should of been running 1.6.4-MITE.
Ok for your question all you have to do is follow my guide.