Please be sure to review all available themes to make sure they are still supported. If they are not supported and you do not want to remove them from the WordPress portfolio, please make a note somewhere on the theme page that states that if you choose to use that theme you are on your own. I and a few other folks are using the Snow Summit theme and it does not appear to be supported. Since so many people who use WordPress are not developers we rely on support forums to get answers to questions. If a theme is not overseen by its creator and updated regularly you can be sure the users will run into frustrating trouble.