That version of the client does not compile for me, the one that does is the 0204 client source in the IGE Mod.
Only way I can get it to the doors is using the launcher and even with that it doesnt show a login screen.
I'm looking at the 0204 client in IGEMod.rar. I don't have delphi though so I can't try to compile it. You have source code though so like I said it shouldn't be too difficult to change the code back to the old style login system. To my knowledge all the Launchers do is pass the server name and IP to the client and maybe a check or two to ensure it is running with the launcher.