Our premium plugins are hosted on our servers and their updates are controlled by our API system. To get auto-updates for a plugin, you need to have first activated the premium license on your website. Only then you will get notification about the new plugin version and will be able to update it. Otherwise, plugins must be updated manually by downloading them and uploading them to your website.
If an update to the newer version is available, WordPress will notify you in the Dashboard - Updates section, where by clicking on the plugin checkbox and then clicking Update Plugins, you will install the latest available version of a plugin.
You can also get a plugin update in the Plugins - Installed Plugins section to see that a newer version of a plugin is available.
Just click on the Update now link to get an immediate update.