Download Parent Theme

Hi,
I’m using WordPress as my host and trying to create a child theme. I need to download the theme I’m using right now “Singl” to create the parent. I’m sure it’s something very simple, but after numerous searches I cannot find the right advice. So to be clear I’m creating a child theme on my Mac but first to need to upload the parent theme to my hard drive so the extensions can match. Any help would be great.
Thanks in advance.
KW