Thread:Ireithien/@comment-5153769-20130623032544

Download Magic Launcher and run it. Then, download Optifine HD Ultra (whatever the lastest version is). Click "Add" next to your internal mods in magic launcher, and navigate to where you saved Optifine. Double click the zip to add it. Click "Ok", then run MC. Easy as that. Just do the same thing for any other mod... 