To install Browsersync you'll first need to have Node.js and NPM installed. For more information see the SO documentation on Installing and Running Node.js. Once your project is set up you can install Browsersync with the following command:
$ npm install browser-sync -DThis will install Browsersync in the local node_modules directory and save it to
your developer dependencies. If you'd rather install it globally use the -g flag in
place of the -D flag.