ocolus-toolkit/includes/plugins-3rd-party/ovic-popup-builder/includes/popup-builder.php
line 115
wp_enqueue_style( 'ovic-popup-builder', OVIC_POPUP_PLUGIN_URL . '/assets/css/frontend.css' );
wp_enqueue_style( 'magnific-popup', OVIC_POPUP_PLUGIN_URL . '/assets/css/magnific-popup.css' );
wp_enqueue_script( 'magnific-popup', OVIC_POPUP_PLUGIN_URL . '/assets/js/magnific-popup.min.js', array( 'jquery' ), '1.1.0', true );
wp_enqueue_script( 'ovic-popup-builder', OVIC_POPUP_PLUGIN_URL . '/assets/js/frontend.js', array( 'jquery' ), '1.0', true );
The slashes before /assets/ were not necessary.
I am sorry but your support is incredibly slow. It took you 3 days to ask me for my ftp, and you didn't need any ftp access. You can do this changes via the wp-admin.