Just to clarify, the reason it doesn't work is not because the server is expecting version XXX and the client says it's version YYY (the server doesn't even ask). Instead, it has to do with the network code (specifically OpCodes) that are used during the login. Each of those clients use different OpCodes to initiate the login. The server looks for the OpCode used (OP_SendLoginInfo), and based on that, is able to tell which client is talking to the server.
In theory, you can have ANY client connect to the server, but the server has to be able to communicate with it. This means dissecting encryption, OpCode mapping, and packet structures. This is on top of the code for actually making it work (primarily for new features).
If all this was easy, the Emu community would still be chasing Live. Unfortunately, it's not, and at this point, there is some occasional work with the Anniversary client, but because we don't have many (if any) packet collections when Anniversary was first launched, we're pretty much shooting in the dark.
The reason most "illegal downloads" don't work is because they are NOT Titanium and don't have the Titanium executables, etc, that send OpCode 0x4DD0 for the OP_SendLoginInfo packet.
I hope this sheds some light on why you HAVE to have Titanium.
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