The directory structure should be
/styles/stylelename/*, for example there is the default style
/styles/prosilver/*. You should have
/styles/elegance/*. Looking at the download it has sub themes like elegance_aqua, those would also go in in the styles folder.
To elaborate on the sub themes they inherit files from the base theme so if you wanted to use elegance_aqua you first need to install elegance.
“Results! Why, man, I have gotten a lot of results! I have found several thousand things that won’t work.”
Attributed - Thomas Edison