[TorpX]

As Longknife said, you are missing the patch for RFB.

As far as it working; if you don't see any new loading screen for RFB, then something is wrong. Usually, this is due to Windows preventing the relevant game files from being changed, or you have an extra folder left over from when you unzipped the mod. This would prevent the mod from being properly enabled.

Your mod structure should look like this:

C:\MyGames\SilentHunter\Mods\RFB_2.0\Data\.....

Not this:

C:\MyGames\SilentHunter\Mods\RFB_2.0\RFB_2.0\Data\ .....