Please update the existing LyX 1.4.5 to 1.6.6 using the links below. This version of LyX relies on qt4 so setup.hint has been updated.
ftp://ftp.devel.lyx.org/pub/lyx/devel/lyx-1.6.6-1-cygwin-src.tar.bz2 ftp://ftp.devel.lyx.org/pub/lyx/devel/lyx-1.6.6-1-cygwin.tar.bz2 ftp://ftp.devel.lyx.org/pub/lyx/devel/cygwin-setup.hint Thanks, Bo
