Enfold has had a pretty busy update schedule since release with lots of new features being added in as we get requests for them. The theme also needs to stay up to date with the newest version of WordPress and all of the supported plugins (like WooCommerce) so staying up to date is important.
Update through WordPress
From within the Enfold theme admin you can add your ThemeForest username and API key to get automatic update notifications just like you would from a theme installed from the WordPress directory.
Your UserName will be the same one you use on ThemeForest. You can find your API key from your Settings>API Keys section:
Update through FTP
You can also update over FTP if you run into any issues with the WordPress updater or if you just want a bit more control over the updating process.