You need to follow the Windows upgrade instructions ( https://docs.npmjs.com/try-the-latest-stable-version-of-npm )
tl;dr - npm -g install npm
does work, but the old version of npm is still in your PATH.
To fix this, do one of these:
Option 2: remove both of
C:Program Files (x86)
odejs
pm
C:Program Files (x86)
odejs
pm.cmd
Or
Option 3: Open cmd.exe as administrator, navigate to C:Program Files (x86)
odejs and
then run the installation without -g:
npm install npm@latest
*There is an npm package that automate this Option 3:
npm install -g npm-win-upgrade
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