C:>npm -v
5.5.1

C:>node -v
v8.9.3

C:>npm install -g @angular/cli
npm ERR! code ETARGET
npm ERR! notarget No matching version found for @angular-devkit/architect@0.12.3

npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.
npm ERR! notarget
npm ERR! notarget It was specified as a dependency of '@angular/cli'
npm ERR! notarget

npm ERR! A complete log of this run can be found in:
npm ERR!     C:Users44128785AppDataRoamingnpm-cache_logs2019-01-24T09_50_
04_779Z-debug.log

1) Rename your current node_modules to node_modules_backup
2) `npm install -g`
3) `npm install angular-cli -g`