Auto Updater
You can enable the auto-updater by activating the plugin on the settings page of the plugin. After you have activated the plugin you can update the plugin directly via the default WordPress update page (http://www.yoursite.com/wp-admin/update-core.php). If you don't see an update available, try to press the Check Again button.
Manual update
If you have trouble updating the plugin via the auto-updater (some multi sites setups have issues), you can always grab the latest package via this page!
You can install it in your WordPress Admin Dashboard via Plugins -> Add New -> Upload Plugin. Select the downloaded plugin ZIP package and press Install Now.
Note: It is not required to deactivate/uninstall the current version as WordPress will replace it automatically with the new one. If you want to uninstall the current one first, please make sure that you disable the Delete settings on Uninstall setting on Advanced tab of the plugin settings.
Note:
The plugin you have downloaded via CodeCanyon isn't always the latest version. Unfortunately for every update uploaded to Envato/CodeCanyon, a dozen sites will automatically distribute the plugin illegally. That is why minor updates are only distributed via the build-in WordPress auto-updater. Major releases will of course always be available on CodeCanyon as well.