In order to run the application Rails 4 must be installed.
For windows: you can install Rails 4 with Ruby here => railsinstaller.org/en
For ubuntu: follow this tutorial => railsapps.github.io/installrubyonrails-ubuntu.html
After Rails are installed, in the command line/terminal navigate to the application folder and run “bundle install”
After the bundle is installed issue a command “rails s” in order to start the server.
The application will start running and will be available at localhost:3000 (port may vary depending on configuration).