http://www.ntg.nl/pipermail/ntg-context/2013/071049.html
Taco keeps an archive of windows binaries on http://foundry.supelec.fr/gf/project/luatex/frs/
not found
(click on package name to get the list of older releases) but they were compiled on a different compiler, so you need to check yourself whether they work for you or not.
In case not, my best bet for downloading it would be fetching luatex.dll from an arbitrary commit from http://tug.org/svn/texlive/trunk/Master/bin/win32/
not clear to me how to extract a certain older version!
Most probably the latest binary is still 0.72.0 in which case you > > can also fetch it from http://www.ctan.org/tex-archive/systems/texlive/tlnet/archive
The version is not obvious to me! Seems more or less current. No older archives!
http://mirrors.ctan.org/systems/texlive/tlnet/archive/luatex.win32.tar.xz
No older versions!