Well, my computer sucks so I was going to install Optifine for 1.6.4 for Direwolf20. So, this time it's a jar not a normal .zip for it so I did the normal put it in the Jarmods and loaded it up. Everything loaded fine but Optifine was not in their. So I tried to put it in coremods nothing. Then put it in the mods folder and it just shuts off on me. I really need this and does anyone have any suggestions?