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Installing Different Version of Optifine


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I'd like to install a different version of Optifine to use with Tekkit Classic. I believe the Multi-core version of Optifine will give me a better performance, so I'd like to install that rather than the version of Optifine that comes with Tekkit Classic. Is there any way to install the Multi-core version of Optifine over the one that's currently installed? I tried copying the Multi-core Optifine classes into the modpack.jar and over wrote all files, but Tekkit was no longer able to launch.


Anybody have any suggestions?

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