Either
explore the FTP directory to see a number of versions to download, or can simply change the url link on the mirror download server to any version number (going back at the very least to 1.113) by changing the XXs to the proper version number: http://download2.taleworlds.com/mb_warband_setup_11XX.exe (the main download--without the 2--doesn't seem to have as many old versions).