Installation was interrupted and now I can only 'Upgrade' the site
If you failed to finish an installation and the site doesn't work, but trying to reinstall brings you to the upgrade screen, you'll need to manipulate a few files.
First you'll need to delete the /conf/config.php file, next you'll need to create a blank file /install/not_configured. Once you've done this, you can browse to the installation url (www.mysite.org/install/index.php) and the installation will run from the beginning.
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