Update to 1.10.0.81, but some units may be not given under player control in any missions. You can make missions in generator or editor and give them to the player, of course. Or add them to exisiting missions.
You should also install JSH mod 1.3.5, which not only adds many more units, but uses them in original campaigns as well (but this mod requires version 1.10.0.81, so patch your game first).