Should you want to make some core changes to the theme (for whatever reason) or add some sweet new features, a child theme is the best way to do just that. Shortly, because all your adjustments and additions to the theme will be safe when parent theme get updated. Read about child themes in the Codex. You'll find
higo-child.zip file in your download. It's a simple starter template for your future theme based on Higo. Install it normally as any other theme.