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Yup, got the same problem, Renaissance mod is not working with a Fitgirl Install of BO1 and the BGamerT5launcher My friends won't buy the game so we're stuck with just custom maps which is still a good thing for us :).
By the way if someone is able to make Renaissance mod with BGamerT5 I'm following this thread 
Sadly it does not work for me. After using the \map command, I have a timer counting up and then Plutonium crashes.
Yes, I've put all my "maps.ff" on the Zone Folder in my BO1 Game Directory and I have selected the map in the "Mod" menu ingame.
Also worth saying, the command is " \ map nameofmap.ff" no with a "slash" ( / )