rfb and rsrdc are made for 1.5 and wont work for 1.4
but there is still a 1.4 version of TMO you can use
find it here:
http://www.subsim.com/radioroom/down...o=file&id=1101
as RR said if you want to use most of the mods out there you need to get 1.5, its a whole lot more than uboats.
it really shouldnt be called uboats because they are only about 10% of whats in 1.5