You need node v0.8 or higher to run this program.
To install an old and unsupported version of npm that works on node 0.3 and prior, clone the git repo and dig through the old tags and branches.
npm is configured to use npm, Inc.'s public package registry at https://registry.npmjs.org by default.
You can configure npm to use any compatible registry you like, and even run your own registry. Check out the doc on registries.
This is basically an identical copy of the npm app. The only difference is that this app is using a modified version of init-package-json instead The original npm app can be found here: https://github.com/npm/npm/
Make sure you have node installed. From the root directory of the npm project where you want to use jpm, run: npm install jmpr-jpm