Hello Eric972,
It’s simple to upgrade theme from free to pro. Just buy the theme and download it. After download the theme, Go to appearance > Themes and Add New theme and activate it. After activating, only some section like slider right section need to re-set, because there are lots of additional options for the theme. If you face any problem, we will help you in each step, so don’t hesitate about the problem after using pro theme, we will help you in each steps.
Regards,
Acme Supports