I attempted to upgrade to 5.4.2
I had replaced the concrete/ directory and subsequently attempted to access the url;http://www.korunutrition.com/index.php/tools/required/upgrade.php...

However, now I have the following error when trying to access my site;

Warning: require(/home/content/82/7083882/html/updates/concrete5.4.2/concrete/startup/config_check.php) [function.require]: failed to open stream: No such file or directory in /home/content/82/7083882/html/updates/concrete5.4.2/concrete/dispatcher.php on line 11

Fatal error: require() [function.require]: Failed opening required '/home/content/82/7083882/html/updates/concrete5.4.2/concrete/startup/config_check.php' (include_path='.:/usr/local/php5/lib/php') in /home/content/82/7083882/html/updates/concrete5.4.2/concrete/dispatcher.php on line 11

I have my database backed up etc but I have no idea what to do from here. Can anyone help?

Many thanks,
Steve