1. Download OptiFine:
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Visit the official OptiFine website: [OptiFine download]
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Make sure you download the version that matches your Minecraft version. You can find this information by launching Minecraft, going to Options, then Credits.
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If the version you need isn't listed on the main page, click on "Show all versions" at the bottom.
2. Install OptiFine:
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Once downloaded, double-click the OptiFine installer.
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You may see a prompt to choose which program to open the file with. Select Java Platform SE Binary.
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The OptiFine installer will launch. Click "Install" to proceed.
3. Launch Minecraft with OptiFine:
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Open the Minecraft Launcher.
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You should see the OptiFine profile listed next to the Play button. If not, select "Installations" at the top.
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Click on the OptiFine profile and then "Play" to launch Minecraft with OptiFine.
Here are some additional things to keep in mind:
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Make sure you download OptiFine from the official website to avoid malware.
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OptiFine is sometimes in beta testing, so there may be bugs.
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If you plan to use OptiFine with other mods, you may need to install Forge first. You can find instructions for installing Forge on the Forge website.