Thread:Project:Support desk/upgrade Mediawiki 1.15 to 1.21/reply

Hi!

What you did is basically correct, however, you might get some of the problems, because you copied the new files over the old ones. This leaves some old files in place, which can cause problems. The recommended step is to use a new folder instead. More information are here: Manual:Upgrading.

Basically (in short and maybe not complete): Extract the new files into an empty folder, copy LocalSettings.php and images/ there. If you use extensions, put updated versions of them in the new folder extensions/. If you use a modified skin (to be found in the folder skins/), make sure to copy and update it as well.

All steps are explained in detail on Upgrading. If you have further questions, don't hesitate to ask here. :-)