To change the logo and header go to Theme Options > Header builder > https://gyazo.com/8a63b067d2102534f91a5bf68483b6da
Header builder video tutorials https://www.youtube.com/playlist?list=PLMqMSqDgPNmDu3kYqh-SAsfUqutW3ohlG
To change the footer go to Static blocks > edit Footer static block using Elementor.
Besides, update Elementor Pro plugin to the latest version because you use out of date version of plugin.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.