When I go to http://download.wikimedia.org/mediawiki/1.19/mediawiki-1.19.2.tar.gz I get an error and the file does not download.
However, I was able to get it to download not through my web browser but through a remote ssh connection to my server and by sending the command:
wget "http://download.wikimedia.org/mediawiki/1.19/mediawiki-1.19.2.tar.gz"
Topic on Project:Support desk
Downloading the file works for me. Maybe some temporary problem.