Installing Fabric
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Download the Fabric Installer
Go to the official Fabric website and download the universal installer (.jar).
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Have Minecraft 1.21.11
Open the official launcher and run version 1.21.11 at least once before installing.
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Run the installer
Open the .jar, select version 1.21.11, check 'Create profile' and click Install.
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Select the Fabric profile
In the launcher, choose the 'fabric-loader-1.21.11' profile before playing.