Click the file link below to download Stock Volatility Calculator 1 (historical-volatility.zip) from software publisher's official website. You can right-click the file link and select "Save link as..." menu to download this file to a specified directory on your computer.

http://www.optiontradingtips.com/resources/historical-volatility.zip

http://www.optiontradingtips.com/resources/historical-volatility2.zip