Creating Child theme

Use the child theme for Responsive I. You can download it here:
https://cyberchimps.com/guide/how-to-install-responsive-child-theme/

Then update the code at the top of style.css to say “Template: responsive-mobile” and replace the “core” folder with a copy of the one from Resonsive II.

There is a separate child theme for Responsive II, more info here:
https://cyberchimps.com/guide/responsive-ii-example-child-theme/