I want to purchase Auron SMS Server. Do I need to purchase a separate Auron SMS Component License?

No you don’t. The SMS Server does use the Auron SMS Component, but a license of SMS Server automatically allows you to use the SMS Component. No additional license is required. The same applies to the Auron Email Component: Auron Email Component is used by SMS Server to send/receive e-mail messages, but you do not need a separate license for that. All is covered.