1. Download your website so you have a backup.
2. Upload the contents of the 'Store-Buildr-Version-2.0-Update' folder to your Store Buildr website location, overwriting existing files.
Once you have done this once you will have an auto update feature installed, and you will see 'Version: 2.0' at the top of your admin home page.
You can update your website directly from your admin home page with the click of a button in future. As soon as a new version is released you will see an option in your admin home page to upgrade to the latest version.