Thanks @radwic!
I'm not sure what system you're running on but I've played quite a few multiplayer games without some of these steps. Note that I've always played on Windows 7 as I've found performance problems I haven't been able to get past on Windows8/10.
I've never needed to install IPX Wrapper as we just used the Direct IP option (can't remember the full title of the option at the moment); is there an advantage to using IPX rather than the Direct IP/LAN via Hamachi?
Also note, this game works over LAN if I recall correctly without any third party software.