website went down with update

Try MANUALLY updating. Download WordPress again and unzip it. Access your server via SFTP or FTP, or a file manager in your hosting account’s control panel (consult your hosting provider’s documentation for specifics on these), and delete then replace your copies of everything on the server except the wp-config.php file and the /wp-content/ directory with fresh copies from the download. This will effectively replace all of your core files without damaging your content and settings. Please read the Manual Update directions first.

Backup: If you haven’t already done, always backup everything (including your database) before doing any actions, just in case something really goes wrong. You can never have enough backups!

• This reply was modified 6 years, 4 months ago by t-p.

I have no idea how to do any of that! And I don’t understand why the heck I need to do this. My site was working fine until wordpress updated and messed it all up.
My server is also saying that they are PCI Compliant so they do not accept http, it has to be https… So is that the core problem with the update? I don’t know. I don’t know about any of this stuff EXCEPT everything was running fine. I have a membership site and now it won’t even load!
Please help… ??

This is now what my site looks like-just code! and I can’t get into my wordpress admin because the below message is what i receive when I try!

SNIP

• This reply was modified 6 years, 4 months ago by Jan Dembowski.
• This reply was modified 6 years, 4 months ago by Jan Dembowski.

Please do not post code now than 10 lines, it doesn’t work here.

If you need to, use https://pastebin.com/ and share the link to that paste instead.

First off, you are using an outdated WordPress version (4.8.7), which has publicly known security vulnerabilities.

So consider updating to the latest version 4.9.7 as I suggested in my previous reply.