New coupon:
https://www.udemy.com/ethical-hacking-system-hacking/?couponCode=PROMO_2017
Thanks. This guy's website linked from his Udemy profile page says:
"We're sorry, this site is frozen.
If you are the site owner, please
click here to contact us
regarding the status of your website.
Please do not contact us if you are not the owner of this site."