Make "Save and Continue" buttons primary buttons.

The "Save and Continue" button on each step of the install process should be a primary button. To quote Luke Wroblewski:

A typical Web form usually enables several “final” actions. Actions like “Submit”, “Save”, or “Continue” are intended to enable form completion –the primary goal of just about anyone who has started filling in a form. Because they enable the most important action on the form (completion), they are often referred to as primary actions.