Try sending the mod though a flash drive not the internet that fixed the problem when me and my brother couldn't connect. (Note it wasn't with RoM:AND but it did fix the problem.)
I ran Rise of Mankind - A New Dawn 1.75.exe and the files ended up in Beyond the Sword\Mods\Rise of Mankind\Rise of Mankind - A New Dawn.I love the idea but cannot get it to run, it downloads, installs to the right place, and then the mod will not show up to be loaded in game.