I downloaded a couple of fonts, and initially I just copy and pasted them into the Fonts folder in Indesign's folder group. That didn't work, although I think that's exactly what I did when I downloaded a font for PS a few weeks ago. So then I tried extracting the files, right click and install on the computer, but when I right click, there is no option to install.
OS? What are the fonts?
Are you sure they're font files? What's the extension.