Unzip node contents and set environment variable NODE_HOME with the path.
Create subdirectories npm-global and npm-cache
Add %NODE_HOME% and %NODE_HOME%\npm-global to the PATH.
Execute:
npm config set prefix "%NODE_HOME%\npm-global"
npm config set cache "%NODE_HOME%\npm-cache"
npm install -g minify
npm-global and that the minify command is available.js