WPMU DEV coursepress plugin uninstall

I installed WPMU Dev's Coursepress plugin yesterday, but I prefer an existing courseware plugin I use (WP Courseware), so I uninstalled Coursepress. Now, however, my site redirects to the home page when I try to go to one of my old pages, http://www.sunumofisi.com.tr/en/courses, or any subpage (/en/courses/fundamentals, for example).

How do I stop the redirect Coursepress apparently created?