firstly, the version you downloaded is just the file, sadly this expects you to know where to put it, so I have 2 solutions for you.
First Method:
Download my recompressed version of the mod. The mod is the same, except I've made all the folders for you. All you may need to do is create a folder named "Data" inside your CoH folder. Then extract my zip file to Data. It should then work. Remember that to see it you must change your in game chest emblem to match that of the mod. In this case you must set you chest emblem to the letter S. It will work on any human character regardless of male/female/huge.
Second Method: If you don't yet trust or know the Akurei name in CoH mods. Open your City of Heroes folder. Now there create a folder named "Data". Next inside your Data folder create a new folder called "texture_library". Inside the texture_library folder, create a folder named "PLAYERS". Inside PLAYERS create a folder named "AVATAR". Inside AVATAR create a folder named "Super_Shared". Inside Super_Shared create a folder named "Emblem". Finally drop the file you downloaded into your Emblem folder.
And yes, there are some of us, who have made CoH into entirely different worlds. If you want to see something changed, but don't want to wait for new Issues. There are plenty of forums around still focused on modding CoH.