i have bought your megamenu and tried to install it several times.

Copy both modules (md_megamenu and awe_builder) manually into /modules and second time into /modules/contrib.
After activating the modules i went to activate the mainmenu for megamenu. If i click the edit button i got only a blank site, no error.

I restored fresh installation and install the modules with the admin backend. I activate the modules and the same problem as before. It is not possible to build/edit a megamenu.

In your online docu you describe that there is a menu entry megamenu. I cannot find this menu entry but think this is for Drupal 7.

My website: Drupal core 8.5.5, PHP 7.1
What i am doing wrong?
Are there missing dependencies, like special libraries?