Can't find them anywhere.
installable exe here: http://sourceforge.net/projects/avidemux/files/avidemux/2.6.4/avidemux_2.6.4_win32.exe/download
7zip win32/ or win64/ here: http://avidemux.org/nightly/ unpack with 7-zip (http://www.7-zip.org/) replace installed avidemux with unpacked content.
Will they no longer be posted on sourceforge as was done with previous versions?
Only 2.6.4 currently are nightly and this one:
http://sourceforge.net/projects/avidemux/files/avidemux/2.6.4/
avidemux.razorbyte.com.au is down/no longer available.