1. Set up your System
You must have a working installation of Ruby, ImageMagick, and one of SQLite, MySQL, or PostgreSQL. See the "Installing Refinery Prerequisites" guide for more information.
2. Install ExecJS
gem install execjs
3. Install Rails
gem install rails --version 4.2.6
4. Generate an Application
rails new my_new_application -m http://refinerycms.com/t/3-0-stable
This will create a new Refinery ready Rails application, install all the dependencies using Bundler, and set up your database.
5. Start up your site
That's it! If all went well, then starting your site should be as simple as running:
cd my_new_application rails server
Now visit http://localhost:3000/refinery and you should see your Refinery CMS site and you will be prompted to setup your first user.
That's all it takes to install and run your Refinery CMS site!
6. What now?
We highly recommend you follow through the "Getting Started with Refinery Guide". It teaches you how to customize your site design and create your first custom engine.