so i wouldnt be suprised if i need to give someone the particle files but it just doesnt make much sense to me.
Isn't this what you'd have to try though?
All I know is that the first installer didn't show the portal, which was kinda funky.
But when I got only the exports in the zip and pasted into exports.
There was an error about a particle, infact, maybe even a billboard used for the map.
As mentioned before, I think this problem would be solved if you actually put "everything" the map needs into the installer, I'm very certain the map would of worked if I'd have those files in the game folders, which I obviously didn't.
You should make the installer again, and put the objects and particles used for it inside the installer since it's just to create 1 big folder with subfolders in them since I saw you used installcreator the very same software used for the map pack I made.
I really hope it works out for you, but I do believe it would all be solved if you just remade the installer with everything used in the maps, there's nothing stopping you from doing this.
Who knows maybe you don't even need just THOSE particles, but something is needed for the map to load. Putting everything where you have it for someone else should do the trick if the installer is made correctly.
All I can say.