A couple of suggestions:
1. I always unzip downloads into a temp directory ("Unzipper") so that I can see better what I am dealing with -- folders, sub-folders, no folders, whatever. Then you can move the files and folders you need into their proper places, and create or eliminate folders you need or don't need. That works much better than blindly blasting a zipped file into your FS directory.
2. Many times the authors of the aircraft or repaints like to put themselves or their group in the aircraft config file as the manufactuer. As a result, Project Open Sky's planes show up in the "Select an Aircraft" window as Project Open Sky, rather than Boeing or Canadair, or whatever. Sometimes you just have to look around.
3. Many times setting up a repainted texture in an existing aircraft file installation just doesn't work for some reason. I find it is often more effective to set up a clean "unpainted" aircraft, and then put the repaint in as the only texture. It takes up more space on your hard drive, but saves a lot of headaches.