Since it isn’t obvious, as of today, where the 1.05 update of FF is (win32 only) I figured I would post an FTP link here:
ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/1.0.5/update/win32/en- US/
Just in case you don’t want to download the install (which may or may not require uninstalling of 1.04, I dunno).