Clone the 'stable' branch with GIT:
git clone https://github.com/HashBrownCMS/hashbrown-cms.git -b stable --single-branch --recursive -j8
There are a couple dependencies to get before you can fire up HashBrown. Go into your installation directory and pull them from NPM:
cd ./hashbrown-cms npm install
Run HashBrown and visit http://localhost:8080 to see it in action.