-Drivers which come with a Behringer product will always be found on the respective product page, under the 'downloads' tab.
For example for the Xenyx 302 USB the drivers would be found at http://www.behringer.com/EN/Products/302USB.aspx then under the downloads tab pictured below:
TIP: Using the Search Box on the site is a quick way to get to a product page (Located on the Top Right of the website)
Then simply scroll down the page till you get to the driver section and choose the suitable driver for your system (below is what the Driver section looks like).
Written by Patrick K for Behringer, Music Group.