How can I increase the difficulty to 200% in the Armageddon's Blade campaign?

I just checked this specifically on my end: I have the HD mod by baratorch, and my version of Heroes is the Complete Collection SoD (game menu: pink background with a moon, a Knight, and half a Lich's face, as in The Shadow of Death). Now, I checked ALL 3 Campaigns: The Shadow of Death, The Restoration of Erathia, and Armageddon's Blade, and in all these 3 campaigns, you CAN choose the difficulty from Pawn to King! You can select it right in the game, where those campaigns are located! I haven't messed around with any tweaks regarding this; the HD mod is as it was, and for me, the difficulty is selectable in all campaigns. So look: download the correct HD mod by baratorch and the correct version of the Complete Collection, and you'll be happy