RESTful Authentication Plugin Not Found

I am new to Rails, but when I try to install the REST Authentication
it always says plugin not found. I've followed the instructions on GIT
and I also followed along on the NETTUTS explanation. I copy and past
what is shown but without success. Any ideas out there? Thanks for the

Are you getting that error when you try to do "script plugin/
install..." in the command line? Or an application error you are
getting after you install the plugin?

you can find what you want on github!

Download from here,

Or Follow these steps,