Yes, it is possible to play multiplayer games on pirated copy. So, if you have friends, who want to play, but dont have the game\money to buy it, you still can join.
Possible issues: most Renaissance releases come with version 4.0. To check your version, install the game, run it, in main screen under the menu, you can see your version. So to patch the game to our version, you first need to apply patch 4.0 to 4.15:
http://www.atomicgamer.com/files/87781/the-guild-2-renaissance-patch-4-0-to-4-15
Than, installation is the same, as described in group info.

So, to make it easyer to find players for match, i allowed everyone to create events in communtity. If you intend to play, you just create an event, where you set the time when you will be available for the game, other players will see pop-up message on steam, and might want to join you, or you just discus the other time, suitable for all players, who want to join.

So, as we all know, multiplayer matches are quite long, and not being played for one evening, so i think it would be nice to post the current status of your games, to keep community informated.
Optional information:
Players (current game year [years per turn]) = winner\leader [status]
example:
Player1, Player 2, Player3 (1412 [4 years]) = Player2 [in progress]

one game per comment, and if status changes, please, delete older status, and post new one.