I've recently found a way to modify the main campaign and various other modules to have respawning enemies, but I seem to be unable to access certain other addon's to make the necessary and desired changes. They are as listed;
-Hordes of the Underdark
-Shadows of Undrentide
Everything else seems to be recognized by the toolset, whereas the aforementioned files can't be found even after entering their names into the search-field.
If anyone has a solution regarding my problem, please feel free to answer.