When trying to install, I get the following error:

Checking environment...

Fatal error: Call to undefined function: install_version_checks() in /home/blitzne/public_html/psychoactive/config/index.php on line 199

Also, I had to go to wiki/config/index.php manually, as I wasn't redirected from /wiki/index.php, if that's how it's supposed to work. Any help will be greatly appreciated. Thanks! :)