I have looked around mala, just because I would use this plugin with my new UltraStik.
I did have similar problems to install the problems about plugins and map, but i did get this to work after found this thread again.
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Maybe you should create a little install wizard on this one to make sure to get it installed correct? Here it was maps folder placed wrong.
I also found a another little quirk:
4way45degree.ugc point to a wrong name, wich it should point to "4-Way, Diagonals Only.um", wich was installed by UltraMap.
Another thing:
I'm diddent like why you need to update your path, since you can add ugc as a extension for Ultramap in Explorer. So if you run mala.ugc. Windows should start Ultramap.exe automatic when trying to run that file.
This is more commen way to do.
Otherwice an path.ini would also been fine.