For 1.1.03, you can get it from here:
http://mancubus.net/svn/hosted/gzdoom/tags/
I recommend using a
SVN tool for this (tortoise alone is enough to download, but you'll need the command line tools as well to compile properly, without them it'll show up as GZDoom revision 0).
1.1.04 can be gotten from
the trunk, but it has had a few updates since so it won't be exactly as it was on release day; unless you tell the SVN tools to specifically update to revision 110 (it's the one which had the version bump).