Cheers wakecarter (and everyone reading along, maybe :D),
thank you so much again. I have by now fixed the afforementioned error with the backslashes, which caused me another problem: I ran into trouble with the previous method of downloading resources. By now the experiment downloads them all as I added a Resource Manager component instead. Now I encounter another problem:
I apologize again for the inconvenience and greatly appreciate the support so far. I have updated the repository as well if that proviedes necessary information.
Edit: I am also aware of this suggestion, sadly I have failed so far to implement it - if it is the problem at hand at all: