Hi,
Glad you like the theme. Since you have already installed the Revolution slider and just want to update it, please click on the “update plugin” button on your installation. Please have a look at the screenshot below for assistance.
https://docs.google.com/file/d/0B9j6FQo4cSQFd1ByRFJlLWxWX2s/edit?usp=drivesdk
You will be prompted for the plugin file. The plugin should be in your {theme directory}/framework/plugins folder. You can also manually install it if you want.
Thanks.