package not downloadable

[Zysce]

>npm install webpack-rtl-plugin --save-dev
npm ERR! code E404.] / fetchMetadata: sill fetchPackageMetaData error for @romainberger/css-diff@^1.0.3 404 Not Found: @romainberger/css-diff@^1.0.3
npm ERR! 404 Not Found: @romainberger/css-diff@^1.0.3

[romainberger]

There is no version 1.0.3. You should use the latest version

[Zysce]

The package cannot resolve dependency romainberger/css-diff@^1.0.3

>npm install @romainberger/css-diff
npm ERR! code E404
npm ERR! 404 Not Found: @romainberger/css-diff@latest

[romainberger]

Can you tell me which version of npm you are using?

[Zysce]

>npm -v
5.4.2