Hi There,
Sorry for the inconvenience. Actually, a valid purchase code requires for after-sale support. Due to technical issues, your code was showing invalid. I have come to know that you have purchased from Wrapbootstrap Market.
However, this theme supports multilevel dropdown menu. Only you need to copy to add your dropdown menu. You can follow the code (https://prnt.sc/qhgc6q)
Then you need to add one line CSS in the main.css.
CSS code is below-
.tr-menu .tr-dropdown-menu .tr-dropdown-menu {
left: 100%;
top: 40%;
}
Hope it will help you.
Thanks