The website [login to view URL] was on WordPress 4.3 I think. I had some malicious codes in there or very suspicious one. The upgrade to the latest version has killed a plug-in (as you can see when you check the website now).
I need someone to fix it. In the cPanel, there is backups from the old version on 4.3 that was working. The plugin that is not compatible is Cornerstone.
We also need to increase the security or have a security filter on the website.