Windows

  1. After downloading the fonts, open the font package (.zip). Usually it's downloaded to your downloads folder.
  2. Double-click the zip file to unzip the font package.
  3. In the Start menu, search for 'fonts' or go to Start → Control Panel → Appearance and Personalization → Fonts
  4. Now select your font files and drag them into the Fonts folder

macOS

  1. After downloading the fonts, open the font package (.zip). Usually it's downloaded to your downloads folder. 
  2. Double-click the zip file to unzip the font package.
  3. Open Font Book. If it's not in your Dock, then go to Finder → Applications → Font Book)
  4. Now select your font files and drag them into Font Book

Linux

command-line installation:

cd ~/Downloads   # or wherever you downloaded a font pack.
unzip <font package>.zip
# for a single user
mkdir -p ~/.fonts
cp *otf *otc ~/.fonts
fc-cache -f -v # optional
# for all users
sudo mkdir -p /usr/share/fonts/opentype/noto
sudo cp *otf *otc /usr/share/fonts/opentype/noto
sudo fc-cache -f -v # optional

Gnome desktop for a single user:

  1. After downloading the fonts, unzip the font package.
  2. If it doesn't already exist, then create a .fonts directory in your home directory.
  3. Drag and drop fonts into the .fonts directory.