How do I update a theme on WordPress?

To update your WordPress theme, simply head to the "My Purchases" section of your and re-download the theme files. This will give you the most up to date version of the item available.

Here are instructions on how to update a theme without hurting existing content: http://premium.wpmudev.org/blog/how-to-upgrade-a-wordpress-theme-even-if-its-customized