conquests of alexander

I've been playing a couple of scenarios while waiting for the latest update; and in Conquests of Alexander, when you capture a city that should give you unique units, it no longer does. I know it isn't any of the mods I usually have on, as one of them was blocking the city banner's in the...

[NOTE: I looked for a sub-forum about scenarios, but found none, so I'm posting this here.] After winning all 4 scenarios on Deity, I found "Conquests of Alexander" to be the hardest one, by far. I imagine other players might be struggling with it too, so I'm leaving a guide here. GENERAL...