@richoahu
Have you extracted the file you have downloaded or have you just put the compressed rar file in the mods directory?
JSGME does not extract the files from compressed archives. That part you have to do yourself.
Take a look at
this message for more details on the file structure to use for JSGME.
Oh and one more thing, JSGME does not refresh automatically which means, if you add stuff to the mods directory, just close and restart JSGME and it will see the new mods.