Ok, well the counter-intuitive joke is on me. The backstory to this is in my posts above. Per Stolypin's recommendation, I re-downloaded and reinstalled 1146.1 and during the install, at the screen that says I already have the latest version installed (which has appeared in past install attempts), there is a button in the lower left hand corner that says "Activate DLC" and since that is what I have been trying to do, naturally I have clicked that button in all of my prior but unsuccessful attempts to get Aegean in Flames installed. I mean, isn't that the point, to activate the DLC? Well, here's the secret. Re-install 1146.1 but when you get to that screen with that button, DO NOT, I repeat, DO NOT click the button that says "Activate DLC" and the install will work wonderfully. Aegean in Flames is now the first scenario in my LIVE folder, just like it should be. So my question is: If you're not supposed to click a button in order to install the game, why do you put the button there in the first place?
Could be that 1146.1 full-installer doesn't know about Aegean Flames since it wasn't out yet at the time it was put out, and why 'activate' using it for AF may have failed. Just a thought, since the later installers (the DLC specific one and the 1147.1 updater) do activate it.