As long as you have Minecraft: Java Edition updated to version 1.21.1, downloading and installing Optifine 1.21.1 should be an incredibly easy process that should only take a few moments. From ...

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Installing Optifine 1.12.1 for Minecraft will give your blocks a whole lot more pretty dynamic finesse for you to show off to all your friends.

With Optifine downloaded, right-click and select 'Open with'. From here, select the Java option. Now, a menu for Optifine will appear; click install and then head over to the Minecraft launcher.