How to install this font? Step 1 Download your favourite free fonts. Step 2 Unzip the font file. Step 3 Copy the .ttf, .otf or .fon extension file. Step 4 Paste them in your computer's font folder. Mac OS X /Library/Fonts (for all users), or /Users/Your_username/Library/Fonts (for you only). If your OS includes the Font Book, you can as well double-click on a font file, then a preview pops with an