If you still get this error after installation: The config file (/var/www/html/config/blesta-new.php) and directory (/var/www/html/config/) must be writable by the web server (you can change these back after installation is complete). FAIL
This means SELinux is still enabled you need to fix by doing: nano /etc/selinux/config and chaining it to show: SELINUX=disabled
Then if you still get the error after fixing the SELinux you need to ensure your Blesta folder has the correct permissions: chown -R apache:root ./*
