Theme demo not working

Can someone check why this theme demo does not work.

http://preview.themeforest.net/item/zefir-simple-and-clean-wordpress-blog-theme/full_screen_preview/7650213?ref=mbserv&clickthrough_id&redirect_back=true

it seems to be working fine on my end? A little slow to load, but other than that it’s up and active.