Install Ruby (version Ruby+Devkit 2.4.X (x64)), from here.
Go to the command line and execute:
gem install jekyll bundler jekyll-paginate #This is going to install Jekyll, Bundler and jekyll-paginate on your PC jekyll -v #To make sure it is instaled correctly
To run the site localy, execute:
bundle exec jekyll serve -w # "-w" for watch
To see more about the structure and how to do things to this theme see: Add Pages