After updating Nirvana appearance destroyed

Hi there, after updating WordPress and the Nirvana theme to the latest versions, the website looks totally destroyed! But all settings are the same as before. I am using a child theme. We are starting a marketing campaign so I need to fix this problem as soon as possible. I would appreciate your help on this. It makes no sense to submit the URL, because the site is now in maintenance mode. Impossible to show this destroyed thing. Thanks for your help in advance.