Please explain. Are you trying to install the client, without any mods, or are you trying to install it as a mod?
If you are trying to install it as a client, make sure you are RUNNING it, and clicking "Install". Make sure you got it from optifine.net
If you are trying to install it as a mod, make sure you put it in your mods folder. Remember that using the wrong version of Optifine with the wrong Minecraft version can create issues.
When it "won't start", does it give a crash log, or does it just close? The more detail, the easier it is to help.
EDIT: I know my version of Optifine is outdated. I just didn't want to download 1.12 OF just for this.
I tried to install OptiFine and minecraft won't start!
When you're going to craft a cake and you forget an ingredient. "He needs some milk!"
Please explain. Are you trying to install the client, without any mods, or are you trying to install it as a mod?
If you are trying to install it as a client, make sure you are RUNNING it, and clicking "Install". Make sure you got it from optifine.net
If you are trying to install it as a mod, make sure you put it in your mods folder. Remember that using the wrong version of Optifine with the wrong Minecraft version can create issues.
When it "won't start", does it give a crash log, or does it just close? The more detail, the easier it is to help.
EDIT: I know my version of Optifine is outdated. I just didn't want to download 1.12 OF just for this.
I tried downloading it as a mod. And it gives me a crash log. I downloaded OptiFine 1.12 for mc 1.12.
When you're going to craft a cake and you forget an ingredient. "He needs some milk!"
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Curse PremiumYou need to install Forge first.
"We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far."
Try using C3 or C2 instead. Somtimes, Forge doesn't work the best with newer versions of Optifine.
http://optifine.net/adloadx?f=OptiFine_1.12_HD_U_C3.jar
http://optifine.net/adloadx?f=OptiFine_1.12_HD_U_C2.jar