Before you can install Sails, you will need to install NodeJS.

The npm command can be used to install the latest version of Sails. This will install Sails in the present working directory.

npm install --global sails

Or to install a specific version.

npm install --global sails@1.4.3

If the install is successful, something like this should be returned.

+ sails@1.4.3
added 235 packages from 115 contributors in 13.984s