I've been reading this thread for an hour and fixed a few things, but now I'm stuck with this error when I try to go to =>Extras=>Simple SEO URL Manager:

Warning: require_once(includes/classes/module_installer.php) [function.require-once]: failed to open stream: No such file or directory in /home/speckid/public_html/admin/ssu.php on line 10

Fatal error: require_once() [function.require]: Failed opening required 'includes/classes/module_installer.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/speckid/public_html/admin/ssu.php on line 10

I can't figure out what I need to do here. I think the answer is somewhere around page 77, but I can't wrap my head around it right now.

WIll you help?