All old versions of mkvtoolnix:

http://www.bunkus.org/videotools/mkvtoolnix/win32/

mkvtoolnix becomes more and more bloated with each version.
v5.0.1 is relatively small (25 MB) and seems to be enough:

https://mkvtoolnix.download/windows/releases/5.0.1/mkvtoolnix-unicode-5.0.1.7z

Following files should be unpacked from mkvtoolnix-unicode-5.0.1.7z:

mkvtoolnix\data
mkvtoolnix\doc
mkvtoolnix\examples
mkvtoolnix\libcurl-4.dll
mkvtoolnix\libiconv-2.dll
mkvtoolnix\libintl-8.dll
mkvtoolnix\magic1.dll
mkvtoolnix\mingwm10.dll
mkvtoolnix\mkvextract.exe
mkvtoolnix\mkvinfo.exe
mkvtoolnix\mkvmerge.exe
mkvtoolnix\mkvpropedit.exe
mkvtoolnix\mmg.exe
mkvtoolnix\regex2.dll
mkvtoolnix\wxbase28u_gcc_custom.dll
mkvtoolnix\wxmsw28u_adv_gcc_custom.dll
mkvtoolnix\wxmsw28u_core_gcc_custom.dll
mkvtoolnix\wxmsw28u_html_gcc_custom.dll
mkvtoolnix\zlib1.dll
mkvtoolnix\data\magic
mkvtoolnix\data\magic.mgc
mkvtoolnix\doc\ChangeLog.txt
mkvtoolnix\doc\guide
mkvtoolnix\doc\mkvextract.html
mkvtoolnix\doc\mkvinfo.html
mkvtoolnix\doc\mkvmerge.html
mkvtoolnix\doc\mkvpropedit.html
mkvtoolnix\doc\mmg.html
mkvtoolnix\doc\README.txt
mkvtoolnix\doc\guide\en
mkvtoolnix\doc\guide\en\images
mkvtoolnix\doc\guide\en\mkvmerge-gui.hhc
mkvtoolnix\doc\guide\en\mkvmerge-gui.hhk
mkvtoolnix\doc\guide\en\mkvmerge-gui.hhp
mkvtoolnix\doc\guide\en\mkvmerge-gui.html
mkvtoolnix\doc\guide\en\images\addingremovingattachments.gif
mkvtoolnix\doc\guide\en\images\addremovefiles.gif
mkvtoolnix\doc\guide\en\images\attachmentoptions.gif
mkvtoolnix\doc\guide\en\images\audiotrackoptions.gif
mkvtoolnix\doc\guide\en\images\chaptereditor.gif
mkvtoolnix\doc\guide\en\images\generaltrackoptions.gif
mkvtoolnix\doc\guide\en\images\jobmanager.gif
mkvtoolnix\doc\guide\en\images\movietitle.gif
mkvtoolnix\doc\guide\en\images\muxingwindow.gif
mkvtoolnix\doc\guide\en\images\selectmkvmergeexecutable.gif
mkvtoolnix\doc\guide\en\images\splitting.gif
mkvtoolnix\doc\guide\en\images\textsubtitlestrackoptions.gif
mkvtoolnix\doc\guide\en\images\trackselection.gif
mkvtoolnix\doc\guide\en\images\videotrackoptions.gif
mkvtoolnix\examples\example-chapters-1.xml
mkvtoolnix\examples\example-chapters-2.xml
mkvtoolnix\examples\example-cue-sheet-1.cue
mkvtoolnix\examples\example-segmentinfo-1.xml
mkvtoolnix\examples\example-tags-2.xml
mkvtoolnix\examples\example-timecodes-v1.txt
mkvtoolnix\examples\example-timecodes-v2.txt
mkvtoolnix\examples\matroskachapters.dtd
mkvtoolnix\examples\matroskasegmentinfo.dtd
mkvtoolnix\examples\matroskatags.dtd
