This theme is designed for Concrete 5.5.1. It has Global areas defined which call in Stacks.
The responsive images mentioned in the description will scale an image down as you resize the window or view on a smaller device but will not scale a small image up.
Custom template for the Responsive gallery add-on is applied in the normal way. The template removes the thumbnail switcher and makes the next/prev buttons full height.
Theme also has a version compatible with legacy versions of Concrete5, compatible with Scrapbooks. Additional Global content areas have been set up in the theme which will require Scrapbook blocks to be named as the following:
Contact_Details (additional header content)
Footer_Left (additional content for left hand side of footer)
Footer_Middle (additional content for middle section of footer)