Is it possible to play the GoG version of Blitzkrieg 2 over Hamachi? I have a friend with Gog Blitzkrieg 2 and he says that there is not Nival.net or Direct IP connection option in the MP menu. I'd like to play multiplayer with him to relive some good ol days of Blitzkrieg 2 gaming.

Has anyone here tried and succeeded with getting Hamachi to work in the GoG version of BK2?

Haven't tried with Hamachi but I have successfully connected several times with friends on Tunngle. It is free and Blitzkrieg 1 and 2 are supported. As well as most of the rest of GoG games.

I'd highly recommend Tunngle over Hamachi.