I would not take the fact that the update on the multiplayer screen is greyed out as a definite proof you are patched up.

Ichi is right; check your version on the starting screen, if it says 2.0; then you need to download the 2.01 patch

Download page at totalwar.com

Regarding the router; it's a problem if you want to host a game. If you want to join a game, you don't have to do anything.

So if you are concerned with security, just don't host games...

Louis,