Optifine can't be installed, what to do?

Re
2

I wanted to download Optifine to play Minecraft with shaders, but it is always downloaded as a folder to unpack, although I have Java and Jarfix. Can somebody help me?

mu

But it is always downloaded as a folder to unpack

You mean as a zip file? Did you unpack it?

Sp

Did you run the .jar file?

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