I never packed an editor with the mod, since that would point to my directories. You kinda have to set it up yourself.
If it was working before, then maybe make sure things are in the right folders or recreate the shortcut.
Well, you can make a copy of one of the models and then rename it according to what the map is looking for. But this is likely not the only conflict like this. And even after all that, you'd run into all kinds of issues if you tried running the map in the game. You could also download the older version, open the maps, then save them... But it's really up to me to fix up the maps.
I just realised that I forgot to pack the Cucurbito's new gibs into the gro. Fml.
Edit: It should be good now. At least this one.