Issue with version of NPM dependency

When attempting to install ambiance-plugin-manager I get the following error :

npm ERR! Error: version not found: 1.1.63 : npm/1.1.63
npm ERR!     at RegClient. (/usr/lib/node_modules/npm/node_modules/npm-registry-client/lib/request.js:272:14)
npm ERR!     at Request.self.callback (/usr/lib/node_modules/npm/node_modules/request/index.js:148:22)
npm ERR!     at Request.EventEmitter.emit (events.js:98:17)
npm ERR!     at Request. (/usr/lib/node_modules/npm/node_modules/request/index.js:876:14)
npm ERR!     at Request.EventEmitter.emit (events.js:117:20)
npm ERR!     at IncomingMessage. (/usr/lib/node_modules/npm/node_modules/request/index.js:827:12)
npm ERR!     at IncomingMessage.EventEmitter.emit (events.js:117:20)
npm ERR!     at _stream_readable.js:910:16
npm ERR!     at process._tickCallback (node.js:415:13)
npm ERR! If you need help, you may report this log at:
npm ERR!     
npm ERR! or email it to:
npm ERR!     

I believe there is no reason to have a specific version of npm as a dependency and the line 19 in package.js can be safely deleted.

Open package.js and inspect line 19, then reproduce the reported installation with npm for ambiance-plugin-manager. Confirm the dependency declaration is the source of the version-not-found error and verify that npm install completes successfully without it.