Fontbook help! Font not installing

I have downloaded the font Terminator RealNFI from two seperate sites and tried to install the font, but after clicking install font it doesn't even display in the font list. I have had this font before and disabled it and uninstalled it previously, and so I have downloaded it in order to reinstall it. I am getting no response whatsoever.

I've looked up and down on fontbook in order to find a list of disabled fonts so that I can enable it, but I get nothing. Is there anything I can do?

I am afraid that I have completely screwed up that font and will not be able to reinstall it, even after all the efforts I've been through. Can someone please help?