Installed wiki plugin with FTP, but Wordpress says "template is missing"

Greetings, wpmudev!

I'm a representative of a a Norwegian local newspaper called "Valdres". We're intending to use your wiki plugin in a new project. I downloaded it yesterday, then installed it via FTP using FileZilla in the WordPress Themes folder - see attached image "1".

Image "2" shows the contents of the wiki folder. When I enter the wordpress dashboard I get a message saying the theme is installed, but the template is missing, so I can't do anything with it - see image "3".

What's wrong - have I misplaced some of the files?

Looking forward to your enlightening answers!

Sincerely,
Ben Ormstad
Avisa Valdres