Hello,
I installed this template and then i immediatly updated joomla to version 3.8. Then i got this message:

Notice: Indirect modification of overloaded property Joomla\CMS\Menu\MenuItem::$colw has no effect in C:\xampp\htdocs\KIONN2018\plugins\system\helix\core\classes\menu.php on line 93
Maybe somethig rong with the template?

Folkert