Go to Theme Options > Speed optimization > Menu Dropdown Ajax Loading, Menu Dropdown Cache, Menu Cache, Static Blocks Cache, Remove Query Strings From Theme Static Resources > Off. Activate mentioned options once all changes to the header/footer will be done.
Then enable Elementor for the footer (go to Elementor > Settings > Post types > check Static Blocks and Products) and edit it.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.