How To Reproduce:

1. Install nvm-windows 1.1.9 on Window 10
2. setting mirror
   node_mirror: https://npmmirror.com/mirrors/node/
   npm_mirror: https://npmmirror.com/mirrors/npm/
3. Powershell Enter: nvm install 10.20.1
4. See error

Downloading node.js version
10.20.1 (64-bit)...
Complete
Downloading npm version 6.14.4... Download failed. Rolling Back.
Rollback failed. remove C:\Users\admin\AppData\Roaming\nvm\temp\npm-v6.14.4.zip: The process cannot access the file because it is being used by another process.
Could not download npm for node v10.20.1.
Please visit https://github.com/npm/cli/releases/tag/v6.14.4 to download npm.
It should be extracted to C:\Users\admin\AppData\Roaming\nvm\v10.20.1

Visit https://npmmirror.com/mirrors/npm/ ,bowers redirect https://registry.npmmirror.com/binary.html?path=npm/