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Updating the Fabric loader for an existing Installation in the Minecraft Launcher
Sometimes you may need to update the Fabric loader of an existing Installation because a mod requires a newer version of the Fabric loader. You may encounter an error similar to this one:
STEP 1: Download and run the Fabric Installer
Go to https://fabricmc.net/use/ and download the Universal JAR installer or the Windows exe installer.
Close the Minecraft Launcher! The launcher should not be running when you run the Fabric Installer.
Run the installer:
Select the Client tab. Select the Minecraft Version and the Loader Version. Usually there is no need to change the loader version, the latest one will work in any Minecraft version.
The Select Install Location should point to the Minecraft Launcher data folder.
Uncheck Create Profile, we do not want to create a new profile this time, just install an updated version of the Fabric loader.
Click Install
Close the “Succesfully installed” dialog box.
Close the Fabric Installer.
STEP 2 Change the "VERSION" of the existing Fabric Installation
Open the Minecraft launcher and follow these steps:
The existing Minecraft Installation has been updated to use the latest version of the Fabric loader.