Re: Eatlon theme doesn't work
A theme shows up in the list on the Look and Feel admin page when its stylesheet is in the styles directory, so you should confirm that eatlon.css is in your TikiWiki site's styles directory. In other words, if the theme been installed correctly, www.example.com/styles/eatlon.css (if your site was example.com) will display the Eatlon stylesheet itself.
There's more information at http://themes.tikiwiki.org/How+To+Add+a+New+Theme if you want to check. The theme has been downloaded many times and normally does work as expected. Post again if there's still a problem.
-- Gary