JGI Client Helper makes JOSHGAMES BETTER!!! BETTER!!! MORE FAUCETS!!!
You do not need JGI CLIENT HELPER installed to play on LEM or get most of the experience, it is just an optional enhancement.
JGI CLIENT HELPER requires you to already have installed the Fabric Loader and its API, it does not support Forge currently.
Important note: Make sure you install the 1.20.4 versions of Fabric and Fabric API! JGI CLIENT HELPER currently has not been ported to LEM 2.0 yet.
JGI CLIENT HELPER is incompatible with Legacy4J currently.