I think I may have found the answer to folder problem.
When you download the theme you want in to your WP content and then themes and you are using FTP program which many of us do. If the folder is on your desktop and you click on it and drag it into your FTP it will mess up and just give you one file in it. Delete the one file and use the FTP as it should be used and send it over to the themes folder. It will all upload properly.
Do not drag it in to the folder straight off the desktop will work