Necromancer – “Invasion” [Campaign 3, Mission 3]

Hey guys, I'm playing version 1.0 and I'm getting frustrated with it. I've done everything, conquered all the cities, and cursed them all (except for the top right one). I can't get into the portal; it says I need to have 20 Bone Dragons. I've bought 20 dragons and recruited them from the map, but I still can't get into the portal:mad:. And the checkbox indicating that I've hired these dragons isn't checked:mad:. I've tried different approaches, recruiting dragons before and after cursing the cities, and before conquering the top right city, but nothing works :( I have a few questions: Could this be a bug in version 1.0, because a couple of times, right after cursing the cities, a message popped up saying that the mission was lost. I reload from a save (I saved right before exiting the city), and everything is fine. Which patch fixes this bug? Do I need to apply the patches in order: 1.1, 1.2, 1.3, or can I install the necessary patch directly? Where can I find reliable patches to avoid future bugs? I suspect that my version of Heroes is a pirated one, and that might be the cause of the bug. I want to get a licensed version. Will it work if I install the licensed version and then copy my save files into it? Thanks in advance