now, pls check at these steps:
<blockquote> Then all the zip files from the unzipped folder (component, modules, plugins)</blockquote>after installed all modules, plugins, components, => you need to enable the JA T3 Framework plugin. with others extensions, you need to read theirs guides (part of template userguide in this forum) to make them working on your site.
<blockquote>- What must i do with the „source file“ folder? Should i install like the other components/modules in joomla – Extensions? </blockquote>=> this package contains Source files of Design Template. you unzip this and you will list of source files in there and you open then by Editor Images ( such as PhotoShop, Firework,,,,etc)
PS: If you are creating a new site, i recommend you should download the package having the type is “quickstart” in the download section. you can extract and install it as joomla instalaltion, it will give you clone of the demo site and you can easily customize it.