ionic2 npm install fails on "angular/forms" not found

[darthwalsh]

Running on Windows from the ionic2 directory npm install fails with the error

npm ERR! 404 Not Found npm ERR! 404 npm ERR! 404 'angular/forms' is not in the npm registry. npm ERR! 404 You should bug the author to publish it npm ERR! 404 npm ERR! 404 Note that you can also install from a npm ERR! 404 tarball, folder, or http url, or git url.

npm ERR! System Windows_NT 10.0.15063 npm ERR! command "C:\Program Files\nodejs\node.exe" "C:\ProgramData\chocolatey\lib\npm\tools\node_modules\npm\bin\npm-cli.js" "install" npm ERR! cwd c:\code\temp\react-native-vs-ionic-todos\ionic2 npm ERR! node -v v5.10.0 npm ERR! npm -v 1.4.9 npm ERR! code E404