– removed hgroup tag from markup since it has been removed from HTML5 spec!
– added options to theme options to enable share buttons (now disabled by default)
– added options to theme options to disable event post type (enabled by default)
– oEmbed media files are now automatically wrapped in container div to make them responsive/fluid
It will not override – do you have custom CSS? If you use a FTP client, just copy the contents into the corresponding Theme folder on your website. You can tell which it is as most of the files and directories will be the same. Does that make sense? Or – if you installed the theme through WP proper, I believe you just repeat the process. If you are using the WP method, apparently you must delete it first: http://themeloom.com/support/framework-codex/installing-your-theme/