Assuming OptiFine installs successfully, players should then be able to launch the game's launcher, navigate to the installations section, and see the installation for OptiFine 1.19.

OptiFine is a versatile program that many "Minecraft" players can't imagine going without, particularly when playing on a less capable computer. It's a "Minecraft: Java Edition" optimizer, allowing ...

Here, you should see a OptiFine installation. If not, make sure “modded” is checked in the top right. When you find your OptiFine 1.21.4 installation, play Minecraft using it.