If you are on Windows or do not have it on your Mac, Hiragino Sans W9 is a commercial font. You cannot legally download it for free from unofficial sites.
Hiragino is distributed by SCREEN (formerly Dainippon Screen) and licensed by Apple. If you are using the font for commercial work on a PC, you must purchase the Hiragino Kaku Gothic pack. Downloading a .ttf from a font aggregator is piracy. hiragino sans w9 install
