To install the new font you just downloaded on your Mac device, please take the following steps:
Step 1: Unpack the font from its zip folder.
Step 2: Once unzipped, double click on the font file you wish to install. This will open a preview window displaying the font's characters. At the bottom, you will see the install button.
Step 3: Click install and wait for it to load.
Step 4: That's it! The font is now ready for use on your device.
Note: you may need to restart the application you were working with for it to show your newly installed font.