No input file specified
I am very, very basic at website admin so if anyone can help please talk me through as basic as you can!
Did you talk to your hosting company, did they change anything?
Then, I'd recommend to rename the .htaccess file in the root of your website. Next, go to this URLhttp://yoursite.com/index.php/dashboard...
Log in and type "pretty url" in the intelligent search box, disable it and save the change.
The site should be running now.
Try to upgrade to a newer version and once you're at 18.104.22.168, enable pretty URLs again.
Your suggestion fixed the same issue with my site.