I ´ve just installed Avada theme, and I can see this in the cp:
Broken Themes The following themes are installed but incomplete. Themes must have a stylesheet and a template.
Description: Stylesheet is missing.
How can I solved? Thanks for help.
You are trying to install the main pack that contains more than the theme file(help files, psd-s, etc). Unzip that first and take the theme file from there.