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“npm install -g npm@latest” corrupted my npm installation - Windows 8.1 machine

Hello,
Last month I installed node 10.16.3 LTS and because it didn’t have latest npm version I’ve updated it using this official guide: https://docs.npmjs.com/try-the-latest-stable-version-of-npm (option 2):

  1. removed both %ProgramFiles%\nodejs\npm and %ProgramFiles%\nodejs\npm.cmd
  2. moved ‘npmrc’ file from %ProgramFiles%\nodejs\node_modules\npm to %appdata%\npm\node_modules\npm

Today, after I’ve installed ‘create-react-app’, npm showed me message that new minor version of npm is available 6.11.3 -> 6.12.0 and that I can update it.
I ran npm install -g npm@latest but that just threw me bunch of errors:

C:\Users\Wladyslaw\AppData\Roaming\npm\npx -> C:\Users\Wladyslaw\AppData\Roaming\npm\node_modules\npm\bin\npx-cli.js
npm ERR! code EPERM
npm ERR! syscall open
npm ERR! path C:\Users\Wladyslaw\AppData\Roaming\npm\npm
npm ERR! errno -4048
npm ERR! Error: EPERM: operation not permitted, open 'C:\Users\Wladyslaw\AppData\Roaming\npm\npm'
npm ERR!  { [Error: EPERM: operation not permitted, open 'C:\Users\Wladyslaw\AppData\Roaming\npm\npm']
npm ERR!   cause:
npm ERR!    { Error: EPERM: operation not permitted, open 'C:\Users\Wladyslaw\AppData\Roaming\npm\npm'
npm ERR!      errno: -4048,
npm ERR!      code: 'EPERM',
npm ERR!      syscall: 'open',
npm ERR!      path: 'C:\\Users\\Wladyslaw\\AppData\\Roaming\\npm\\npm' },
npm ERR!   stack:
npm ERR!    'Error: EPERM: operation not permitted, open \'C:\\Users\\Wladyslaw\\AppData\\Roaming\\npm\\npm\'',
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'open',
npm ERR!   path: 'C:\\Users\\Wladyslaw\\AppData\\Roaming\\npm\\npm' }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It's possible that the file was already in use (by a text editor or antivirus),
npm ERR! or that you lack permissions to access it.
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Wladyslaw\AppData\Roaming\npm-cache\_logs\2019-10-17T19_35_58_442Z-debug.log

Now I can’t even run npm -v, it somehow removed my npm folder and just showing me this message:

bash: /c/Users/Wladyslaw/AppData/Roaming/npm/npm: No such file or directory

Is there any way to repair such damaged npm installation without reinstalling whole Node.js?
Thank you