Desktop fonts are available & delivered as OpenType files (OTF). You can install OSX (Mac) and Windows (PC). The OpenType format contains font features and several language support that can be accessed and used in the graphic processing software. We deliver web fonts in four industry-standard formats to support all modern browsers: EOT, TTF, WOFF, and WOFF2. You can embed the Webfont files to your server and display it on your website using the @font-face rule in CSS. For App, fonts will be delivered in OpenType (OTF) format.
For you, Mac OSX users use Font Book Software (Default App on Mac). Just Select the fonts files you want to install and drag the fonts into your library, or you can find Macintosh HD/Library/Fonts and copy the font files to the directory. For the PC Windows, you can select all fonts you want to install, and pop-up of the fonts file will show, click install, and have done.