Eliminando sus Recursos(Assets) del Asset Store.

To disable an Asset that you have successfully published to the Asset Store, email assetstore@unity3d.com with the following:

• Nombre del publicador.
• Nombre del Asset.
• Confirmación que usted desea desactivar el asset(s) mencionado.

You must send the request from the email address attached to the publisher account of the Asset or Assets you want to disable.