PS C:\Users\Jan\Documents> npm install -g cordova ionic
npm WARN deprecated node-uuid@1.4.8: Use uuid module instead
C:\Program Files\nodejs\ionic -> C:\Program Files\nodejs\node_modules\ionic\bin\ionic
C:\Program Files\nodejs\cordova -> C:\Program Files\nodejs\node_modules\cordova\bin\cordova
added 729 packages in 130.33s
ionic start fails because I am on Windows and there seem to be some thing wrong with node-sass for now. I think it comes from app-scripts, so I created an issue there: https://github.com/ionic-team/ionic-app-scripts/issues/1016