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Make sure the Version of Optifine you've downloaded matches the version of MC you want to use

You need to launch into the desired version of MC at least once to generate necessary install files

Close MC

Go to Downloaded Optifine file (should be a .jar file I believe) and right-click it

Go to "Open With"

Select to Open with Java

REEEEEEEEEEEEEEEEEEEEEEEEEEEEE

what os

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