Theme crashing site

Howdy
EnjoyTravel.world is a multi-site install. One of the sub-sites is EnjoyScotland.Travel, and I am trying to install this theme there:
https://themeforest.net/item/mag-full-featured-wordpress-magazine/20463212
After doing so it white screen crashes the site.
Can you see what's going on? I have enabled support access.
thanks! Neil.