fl dont require any 64 bit dlls as fl is a 32 bit process - thus cannot load any 64 bit dlls. There is no need to install any other dlls separately - the installer comes with all dlls required. I assume he has a problem with the installer itself which misses to install some dlls. So check the size of the flmm mods cf folder prior activation. If the size doesnt match it makes no sense to activate fl.