Thread:Project:Support desk/Open the index.php - How??

We are using MW 1.22 and we want to install the extension CheckUser. I installed CheckUser on another Wiki and the only thing to do was to open mypage.com/mw-config/index.php (running index.php) after uplaoding all the files and adding requireidunno in LocalSettings. But yeah, this method (visiting [mypage.com]/mw-config/index.php) ain't work on MW 1.22. After loading "Error 403" appears, although mw-config/index.php exists. I've accses on only one directory. The server and the wiki belongs to my wiki partner and I try to help him.