How to maintain 2 different versions of Angular 2 cli

[MukundSonaiya]

After updating to latest angular cli I am not able to run the older projects using downgraded version. Is there any way I can manage 2 different version of angular cli in system?

I get following error :-

The "@angular/compiler-cli" package was not properly installed.
Error: The "@angular/compiler-cli" package was not properly installed.
at Object. (/Users/mqc/MyProjects/AngularProjects/ArcBlok/node_modules/@ngtools/webpack/src/index.js:14:11)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at Object. (/Users/mqc/MyProjects/AngularProjects/ArcBlok/node_modules/@angular/cli/tasks/eject.js:10:19)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! block-right-cli@0.0.0 start: ng serve
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the block-right-cli@0.0.0 start script 'ng serve'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the block-right-cli package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! ng serve
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs block-right-cli
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls block-right-cli
npm ERR! There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/mqc/.npm/_logs/2017-04-13T10_45_33_394Z-debug.log

Process finished with exit code 1

[grizzm0]

Dupe of #5933

[hansl]

Answered in #5955.

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