What is your current Sitefinity and Sitefinity Thunder version?
I would recommend you to delete that zip files and get the latest Sitefinity Thunder form the following link
(it support 7.1 and the previous versions also) and follow that
documentation in order to install in on your project.
There is no need to unzip that files at all. They are downloaded and used by Thunder itself.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items