Installer is trying to redirect using absolute paths

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I just unzipped the latest version of Concrete 5 to a "concrete" folder in my webserver root and tried to access index.php. When I choose English, it tries to redirect me tohttp://www.mysite.com/var/www/concrete/index.php/install/-/select_l...

How can I get it to remove the absolute filesystem path and only go to /concrete/index.php like it should?

Thanks