won't load on qtcreator 3.0.6 on arch linux

[Choongkyu]

Hello. I had followed the instructions as follows:
downloaded the css file and images folder into my home/Downloads folder.
downloaded the xml file into my home/.config/QtProject/qtcreator/styles folder

and then ran qtcreator with two different types of syntax:
qtcreator -stylesheet darcula.css
qtcreator -stylesheet=darcula.css

when using any other syntax, I get a no file found error message, leading me to believe that either one of the above is the correct syntax. Unfortunately, neither of those lines load the darcula theme. Any help would be much appreciated. thank you!