Latest update crashed joomla entirely

I was having javascript_void errors show up when attempting to edit blogs (we are on outdated joomla 2.5). We update about every 60 days. There was an alert in the backend dashboard saying there was a critical update issues. I downloaded the new installer, uploaded it to joomla and proceeded. I was unable to click the proceed button because of a java error and unable to exit the installer. Meanwhile, our entire joomla site has crashed! I have cloudflare in development mode thinking that was part of the java issue, it wasn't. I'm working on a restoration from a backup right now.