Unable to downgrade Angular from version 6 to 5

Same as the other answer, but this time only commands instead of a difficult to follow screenshot

I wanted to downgrade from 7.0.2 to 6.2.5

ng --version

npm uninstall -g @angular/cli
npm cache clean --force

npm install -g @angular/[email protected]
ng --version

you have to update npm...please refer to screenshot...I've sucessfully downgraded angular 6 to angular 5... downgrade from angular 6 to angular 5

run

npm i npm@latest -g

to update node package manager. then run again

npm install -g @angular/[email protected]

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