For those who have discovered this topic: Islands of Monte isn't dead, it's still under development
After some betatesting, I realized that the expansion needs a complete rework to exclude errors in dialogs and scripts.
The good news is that it seems like I will perform this rework with the new editor as the old one isn't compatible any more.
The bad news is that the editor isn't out yet, so it still has to wait. But at least it gives me time to add new ideas and thoughts to the map and the story.
(All credit goes to DeMenchev for helping me with testing.)
Thank you for your patience