Find it at http://www.devel.lyx.org/~leeming/lyx_setup_136.exe
It's 5.9MB in size.
It's fully internationalized although its messages still need to be translated.
If you're interested in doing so, you can grab the source from
http://www.devel.lyx.org/~leeming/packaging.tar.bz2
It's 82kB in size.
Have a look at installer/lyx_languages/{french,german}.nsh which need
translated versions of the 53 strings. Adding other languages is
straightforward.
The archive unpacks to
packaging/
README
clean_dvi.py
package_lyxwin.sh
dtl/
README
Makefile
dt2dv.c
dt2dv.man
dtl.doc
dtl.h
dv2dt.c
dv2dt.man
dvi.doc
edited.txt
example.tex
hello.tex
man2ps
tripvdu.tex
icons/
lyx_32x32_16colors.png
lyx_32x32.png
lyx_doc_32x32_16colors.png
lyx_doc_32x32.png
lyx_doc.svg
lyx.svg
lyx_32x32.ico
lyx_doc_32x32.ico
installer/
lyx_languages/
english.nsh
french.nsh
german.nsh
abi_util_fileassoc.nsh
download.nsh
ioDownload.ini
ioSummary.ini
lyx_installer.nsi
lyx_path_prefix.C
is_user_admin.nsh
lyxfunc.nsh
strtrim.nsh
Angus